Trying NL2, because I'm bleeding chips right now in NL5, and NL2 now

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No great reads on this player as it was 10max and pretty early on, but his figures were something like 40/5 in a couple of dozen hands so pretty loose overall.
I was in good position, 2 limpers, raised 25c with KK, folds til BB, limpers folded.
Flop 5 7 9
He checked, I bet 50c, he raised to $1, I called.
Turn 2
He checked, I raised to $1.50, which would put him all in, he called.
He turned over pocket 9's. Am I just ignoring his signals when he check min-raises me, or should I always assume KK is on top here and wear it when I'm wrong? In other words can I ever fold KK here without a good read?