IDK where you found 40wt Fork oil. You must be using automotive 40Wt?? I'm 210lbs and run the spacers and 20wt fork oil.
I think the max I could use was about 1.25" long and I found the PVC at Home Depot. In the case of a 200X, I had to turn the OD of the PVC down .020 or so or it would bind in the fork.
Too long of a spacer makes guys strip the fork cap threads - not good.
Have you tried buying progressive springs at all??
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country