It isn't very clear exactly what you are asking but 15% opening early position is quite wide, even 6 max I prefer a little tighter 12-13 % all pairs plus ATs+ AJo+ KJs+ KQo. Even tighter at full ring. If you want to open EP 15% then you will need some 4 bet bluffs, Your figures look ok to me.
If I'm in EP and get 3 bet by a competent player in later position who 3 bets around 3% then the only hands I'm calling with are TT JJ QQ AQs maybe AKo and I'll value 4 bet AA KK AKs. Personally I won't have many 4 bet bluffs here unless I know the 3bettor folds to a lot of 4 bets. In my experience competent players dont 3 bet an EP raiser very often unless they have a very good hand or EP is too loose and or folds to 3 bets too often. I would suggest you don't get too stats led here, how you react is very player dependent.
I will 3bet an EP raiser who is opening 15% a lot wider than a player who opens 7-9% EP.
If the 3bettor in LP is raising 9% then you can flat a few more hands and open your 4 bet bluffing a bit more, I don't keep track of how often say someone 3 bets from the button against EP specifically, it shouldn't happen that often against an EP raise from anywhere on the table. Personally I don't like flatting oop so the 4bet is king for me. If you 4 bet and he continues then you have a clear idea that you are up against a premium hand.
If you are having problems in EP with getting 3bet just tighten it up