Hey Mherold, you said you felt this program mostly in your quadriceps. I can definitely see that cuz bounding is a very horizontal movement and with a short approach, you don't get much vertical anyway and end up "pushing" more with the quads. Try some long jumps. 5 step 6 step.
My fav short approach is the 6 step. LRL, RLR, one two three, one two explode. I'm working my way up to higher approach LJs though since it'll be even more beneficial towards vertical since the GRFs will be way hgher