I've never started the 5 rep phase with less weight than I finished he 10s, and to not finish at your PB seems like a wasted opportunity.
the 5's will cross over to heavy weight then my 10's by then end of week 1. This is manly due to the smaller gap that i no doubt have between my 15 rm's and my 5 rm's that you have
The only reason i will be getting close to my current 5rm's is because it wasnt the 5rm's i setup the cycle with. Basically i fully prepped my HST cycle at the end of my cut, and also I was keeping a little in reserve so that i could bed the routine in through the first cycle.
Squats as an example my 5 rep max from before HST and during bulking was 125x5 or 130x5 somewhere like that.
My prep for HST was 115x5 because i had to be able to do it for 3 sets as well, and wanted to keep a little back. By week 3 of the 5's in this first cycle i should be squatting 122.5x5 for 3 sets, so this will be a pb as far as my HST cycles go, but not as far as all time pb's go. Given that i am 10kg lighter now as well, i would consider 122.5kg pretty good for my first cycle to end on.
So for the big 4 my first cycle should end like this, all weights for 3 sets of 5 reps:
Squat 122.5
Deadlifts 130
bench 75
ohp 57.5
comparing these to my pre cut 80kg bw 1 rep maxes i think its a good end to the first cycle?
dl 155
squat 150
bench 100 (missing inches
, so 95 if i am being totally honest)
ohp 67.5