Hi,
Against 7% you have 31% equity:
board: KsKd7s
Hand Equity Wins Ties
7% 68.74% 266,223 6,534
88 31.26% 119,283 6,534
Against reasonable 5% open raise 18% equity:
board: KsKd7s
Hand Equity Wins Ties
7% 68.74% 266,223 6,534
88 31.26% 119,283 6,534
So 88 should be fold that spot although he is c-betting 96%.
If you´re also calling there pf AK and would raise with 77/AK then I think you can mix up your play raising flop to 4.6-5$ It is very hard him to do with QQ-99 and he would likely only then continue very strong range. Also you then don´t give him option to double barrel his AJ/AQ type hands.
I think you generally shouldn´t bet turn unless you´re willing to turn your hand into bluff and bet big on the river.
He would always going to c/c there QQ-99 and c/f likely 66-22, AQ/AJ. So you only get called hands that beat you. Just try to check it down and hope your 88 is ahead.