The likelihood of you being accepted to a program is as much based on grades/scores/stats as it's based on research fit/match, so the actual % of applicants accepted may not be as important as how well you match w/ your POI.
I think UCCS has had relatively few applicants over the last few years (<150) and has accepted around 10 students each year (I think..?), placing their acceptance rage a little shy of 10% (high for a funded, PhD program), but their program is highly specialized in geropsychology, meaning that most applicants without geropsych background will have a harder time being accepted despite the relatively high acceptance rate. Also high acceptance rates can be a red flag of subpar training.
I suggest you find programs where you are competitive stats-wise and have a good fit w/ your mentor, and worry less about the acceptance rates.