The Amps benefits lower level players alot more, yes. So, as stated, no need to put any kind of level cap.
The Amps of luck? you know, the places where amps are the most efficient, are the places where you can get PKed (DW,CA).
So sometimes you'll need to use 2 or 3 amps of luck/CBs during CA. Expert Chests get split up between the people and each person uses a separate amp/cb.
Those amps are gona be used up quite soon. If you stop the supply from tiger gamble or make em rarer, then I dont see a problem here either.