Your rack pulls were impossible? Well no shit, Sherlock! lol
Seriously though, not to bust your balls but I have no idea why you’d do a set of 12 and then expect to go heavier for a partial. No offense, but you’ve got your approach backwards.
Do your high deadlifts (rack pulls) first, then do lighter back off sets with a full range deadlift variation. The heavier lift will make the lighter lift seem very easy provided you don’t tire yourself with needless reps.
The full DL for hypertrophy is just about the worst idea ever. It’ll kill you, and there are better lifts for growth. Full deadlifts and rack pulls give you a big ass and thick waist and not much else. Even Yates used the overhand RDL in lieu of the full DL or rack pull (RDL’s have a bounce at the bottom and an eccentric portion). Specific tools for specific goals.
You want a solid program? Here’s what a deadlift day looks like for me:
1.) Rack Pull (at whatever height, changes weekly)
- 1-3 reps working up to a max for the day
2.) Full Deadlifts (or) Stiff Leg Deadlifts (from floor or on a plate, changes weekly)
- 1-3 reps working up to a max for the day
My avatar is a picture of a mid shin rack pull with 880lbs at 235lbs bodyweight. On that day I did:
!.) Rack Pull (plates 8" off floor)
225x1, 315x1, 405x1, 495x1, 585x1, 675x1, 765x1, 815x1, 855x1, 880x1 *PR
2.) Full Deadlift
405x1, 495x1, 585x1, 675x1, 745x1 *PR, 760x1 *PR
So right now I’m basically exceeding the RAW American record by 60lbs and the above approach is what I used to get there. I built my base using a Doug Hepburn style program and multiple singles, but changed to this for the past year or so. I pull once a week and change deadlift variations, reps and weight weekly.
There’s my two cents. You can take it for what it’s worth. Best of luck.