I have some time, so I'd like to know if this helps you at all or if you think I'm misunderstanding something. The way I understand it is by first breaking everything down into conceptual parts and explaining it from there:
introversion/extroversion: introverts have the world impact them and extroverts impact the world (keep reading, it'll become clearer).
Function Duality: Involves repression and Fi-Te are related together through it; same with Ti-Fe (keep reading, it'll become clearer).
How are static and dynamic different from each other?
dynamic introversion: perceives where things are going and adjusts to the world.
dynamic extroversion: takes a perception of where things are going and adjusts the world.
static introversion: formulates an understanding of how things occur, in order to have and decide upon scenarios.
static extroversion: takes a scenario and goes after fulfilling it.
How are static and dynamic related to each other?
Function Polarities - Si<->Se, Ni<->Ne, Ti<->Te, Fi<->Fedynamic introversion can contradict static extroversion: the dynamic introvert might express how a scenario fails to succeed.
static extroversion can contradict dynamic introversion: the static extrovert might express how a failed scenario can succeed.
dynamic extroversion can contradict static introversion: the dynamic extrovert might express how scenarios about the world are inaccurate, useless, and/or unnecessary.
static introversion can contradict dynamic extroversion: the static introvert might express how adjusting the world leads to poor outcomes.
Function Dualities and Their Repression - Ti<->Fe, Fi<->Te, Ne<->Si, Se<->NiSimilar to the Function Polarities, Function Dualities (Ti<->Fe, Fi<->Te, Ne<->Si, Se<->Ni) create the same conflict of the Function Polarities, but are metaphysically internalized here in a person, causing a repressive conflict specific and unique to that person. Since these relate by forms of repression, the opposite function in another person is capable of recognizing and alleviating the problems of that repression, potentially relieving the repressive conflict at times or altogether.
Ti vs Fi (Function Ideality):
How are they the same?
Ti and Fi both take a situation and determine various scenarios that could occur in order to choose between those scenarios.
How are they different?
Ti is related to logos in that it has no sentiment to the world that it analyzes. Fi is related to pathos in that it has sentiment to the world that it analyzes. Both analyze and both use logic, albeit the logic of Fi tends not to be as rigorous as Ti, perhaps because humanity makes the mistake in thinking impersonal logic is the only true, greatly preferred, or correct form of logic to be used. But Fi focuses on the personal aspects of how people affect one another and the Fi user, whereas Ti focuses on the impersonal aspects of how people affect one another and the Ti user.
More realistically, Ti and Fi both relate to Fe and Te through repression. But I do think it's still appropriate to single them out from their repressed unconscious, since that doesn't change their metaphysical form, but relates mainly to their motivation.
Fe vs Te (Function Ideality):
How are they the same?
Fe and Te both take a perception of where things are going and use that to adjust the world.
How are they different?
Te is related to logos in that it has no intention of adjusting the sentiment of other people, but the impersonal nature of the world. Fe is related to pathos in that it has intention of adjusting the sentiment of other people, but does not care for adjusting the impersonal nature of the world. So Fe aims to sway or mold the personal sentiments of other people and Te aims to sway or mold the impersonal nature of the world.
Again, more realistically, Te and Fe both relate to Fi and Ti through repression. But I do think it's still appropriate to single them out from their repressed unconscious, since that doesn't change their metaphysical form, but relates mainly to their motivation.
Putting it together
So, from this, we see that Fi and Fe are a bit different in that Fe has a perception of where things are going in the world (dynamic introversion) and aims to adjust the sentiments of others from that, while Fi is concerned with analyzing (producing and sifting scenarios of) the personal aspects of how people affect one another and then aims on fulfilling a particular scenario (static extroversion). And from the Function Polarities, we see that Fi and Fe can contradict each other in two different people. From Function Dualities, we see that Fi has a metaphysical conflict with Te within the same person, while Fe has a metaphysical conflict with Ti within the same person; and that an Fi user with a Te user does not produce a theoretical contradiction between them, as well as with an Fe and Ti user.