Skyrim: Curse of the crappy potions after resto looping

SOLUTION!!!

I can confirm that I too had this issue on the PS3. No matter what I did I could not get above 22% in my items with same information you have given.

I went into game data on the ps3 menu and deleted the game data and the game update for Skyrim. Launched the game and let it patch and reinstall the game. I then went straight to an enchanting table and with no enchanting gear I could create +25% alchemy gear using Grand Gems alone.... I edited a section on Wiki about bugs and stated that I confirmed a solution to this problem.

The armor cap is at a mere 567 displayed rating (667 total = 567 displayed + 100 hidden rating. You get 100 hidden rating for wearing armor on head, hands, feet and chest).

If you are serious about spending the minimum perks for light armor capping, you shouldn't use dragon and you shouldn't use enchanting/alchemy. You should do this.

You can reach 610 armor rating with 9 perks and minor un-perked assistence from alchemy or enchanting. 567 is the armor cap.