Sure, Test P has a 4.5 day half-life, which is about half that of Test C and E, but if you’re pinning daily - the half-life is kind of irrelevant.
I pin Test C daily from Defy as well at 26mg daily (I’ve got below-range SHBG as well)
That’s a conversation for your provider and you to have. People blend them, and you can have them blended for you by pharmacy - but they follow prescriptions.
P hurts more than C, but no real harm difference between the two.
Just watch your e2 when adding HCG. Probably worth your time to start with just Test and get dialed in there before adding a new compound.
For your reading: