13/11 428
3b 5.5
Fold to 4b 20 (but prob small sample)
AGf 35 (so he isnt super aggro OTF)

I usually 4b KK+ here and sometimes QQ,AK and rarely KQo/A5s,A4s,AJo as a bluff (but need to have a read to do that)

Sticking with my most common range here KK+, it makes sense to bet small OTF to push equity.. after we got raised, from the theory point of view, we are supposed to call all of our Aces and few Kings.
From the exploitative point of view, I dont think this line gets bluffed enough. In addition, I do think his range is already super tight due to the preflop action.. expecting mostly JJ-QQ,AK,AQs and probably slowplayed AA (KK). Therefore if he raises, I believe he has got either QQ or AA (sometimes AdKd and rarely JJ and KK).
With KK we arent dominating any portion of his valuebetting range and beating only few bluffs..
Holding AA gives us a little chance on domination KK and split equity with AA.. I am not a huge fan of this call either, but I would rather make a slightly -ev call with AA than folding everything and losing my whole vision regarding his range