I'll agree with most of what's been said here.
Before I went back to powerlifting training, I found that I got the best results from something like this:
One week of 15's.
Two weeks of 10's.
One week of 8's using the 10RM.
Two weeks of 5's.
One week of negative 5's.
12 days of complete rest (Strategic Deconditioning), only taking walks and such.
I also tried both 3 days a week and 6 days a week, 3 days a week worked better. Although I did 6 days a week for quite awhile before giving 3 days a week a try.
3 days a week, and sometimes splitting up the workout in a morning and an evening workout, if possible, due to work.
I also cut back on the number of excersises, from 12 to 9 or 8 in the end. Which meant I had to alternate a lot of excersises.
If I were to do HST again, which I definitely will the day I quit powerlifting, the change I would do, is to try out the really abbreviated routines that started to pop up just when I was quitting HST.
Ie, 4 or 5 excersises, from what I recall you would do 3 sets of each instead of the usual prescribed 1 or 2.
Could look something like this:
Workout A
Squats
Benchpress
Dips
Chins
Deadlifts
Workout B
Front Squats
Stiff Legged DL's
Military presses
DB Curls
Close Grip Benchpress