Haha, I experience a similar conundrum.
The regular LSI (no specific subtype; or Ti subtype) usually does not show any clear interest at first. It is like they just look at you, but... nothing more, haha. As an IEI-Ni, this is simply not enough. I cannot do all the work. I will feel awkward if I have to step out of my comfort zone too much. Like, I would have to be way more Fe than usual to get them out of their shell. Being SO dom, I'd fear people around me noticed I was obviously flirting or trying to get to the guy, haha. Which does not help.
Personally, I have not met any LSI with a strong enough Se subtype yet... oh actually, I might have, haha! Okay alright, this was in middle school, and I was simply not attracted to him. But... he would more openly pursue me, I think... Until he got a different girlfriend, haha. (I think? I don't exactly remember.)