While I was doing some work (okay, monkeying around) with GTO+, looking at cbetting frequencies, I came across a couple similar results to the above. In this solution, effective stack size is 27.5 bb and the pot is 7.5bb (an approximation of 30bb mtt play with antes). Note that BTN here does have 50% of KK+.
GTO+ suggests we should mostly bet TT-KK, and about 50% of AA and Ax--which makes a lot of sense to me. However, instead of betting our lower PPS, GTO+ suggests that we should check/raise more than 50% of them as well as some stronger Ax and only x/c AA, some weaker Ax, and even some weaker offsuit broadways. This goes against basically everything I intuitively think about this spot--i.e. that we want to protect our equity, that we should raise hands that are at the top of our range, and that we should mainly x/c the middle of our range.
Could anyone help shed light on this spot? Obviously, it's pretty contrived and is the closest I could get to basically not having any flop at all. But I think it's pretty illustrative of us playing versus BTN's mostly capped range.