You seem to be approaching this correctly, so we can't really tell you what will work without knowing what you respond to better. You'll have to try...
You will note that one topsets and two 90% backoffs, plus three 90% "medium" sets on Friday, is the same volume as the Texas method, just distributed...
While the skill floor for squats is indeed higher than a leg press, the skill ceiling for both is relatively low. You drive your squat up by getting...