Rocker shims = NO rocker shaft oiling

Anti pump up lifters [ APUL ]. Properly designed APUL do NOT use a paper clip circlip, which is what stock lifters have. They use a much stronger circlip to stop the lifter pumping apart due to pump up.
The minimum pre-load idea came from hot rodders & there is a very good chance that the engine could come to grief. Russian Roulette with a 6 bullet revolver & 7 bullets....
As I said earlier in this thread:
- using strong enough valve springs prevents pump up.
- you have about 0.150" of lifter plunger travel. There is no need to set the pre-load so tight for the reasons stated above.