Pushing powerlifting training can cause u some niggles throughout the body so in principle I’d err on the side on conservative to start and increase from there if things feel good/sustainable.
Meat and potatoes is good. Usually every movement in a powerlifting program has a purpose and when u work hard enough (but not too hard) on it u get benefits. Sometimes that means pushing the non competition lifts, “accessories”, as hard as the comp lifts e.g. train leg press hard = bigger legs = potential for bigger squat over time.
Given your bodybuilding background where you would’ve accumulated plenty of work and muscle already, one of the main points of auxillary work, so I’d emphasise the comp lifts if I was you. That being said some strategic bang for buck accessory work would be beneficial.
Training frequency (how many times per week you do each lift) is highly individual and context based.
For example many lifters bench press 2-5 times a week because it is usually a movement u can recover from quickly (relative to heavy squats and deadlifts).
High frequency can give u faster gains: more opportunity to practice technique and more exposures to a strength stimulus. Can also make it much easier to overtrain/overreach
1x per week for each lift will be sufficient to progress if you are relatively new to powerlifting. You can always increase frequency next program if you find u are recovering well. If you are worried about developing or flaring up niggles/injuries I’d err on the side of once a week (maybe twice a week for bench training)
For the program summary you have up… I’m not a big fan overall. It might not have sufficient volume in the comp lifts to continue to progress long term and the intensity (% 1RM) is pretty high on average. I’d rather see a conservative single (85-90% depending on how you feel on the way day) followed by moderate rep work to build a base of strength e.g.
Work up to 1x1 with some in the tank ~ 85-90% (on days u are fatigued it’ll be closer to 85%)
2-4 sets of 3-6 reps ~60-80% (again it depends) with a few reps in the tank (so not easy but failing or hitting super grinder reps).
Lemme know if any questions. In the end you can’t go wrong with consistently applying effort and working hard (but not too hard lol).