Main villain BB, loose aggro rec vpip above 50.

LJ and HJ call $5, hero AcJh SB ($covers) $40. BB ($600) calls, LJ calls. hJ folds.

Flop ($125) JsTh7s
Hero ($covers) bets $80
BB ($560) calls.
LJ folds.
Turn ($285) JsTh7sAd
Hero ($covers) bets $200
BB ($480) tank folds.

Questions:
What is the correct bet sizing on the flop & turn? Do we ever bet fold?

On these loose passive tables, mostly 100bb effective, but even 6bb ($30) opens going 3-4 ways, is there any merit to iso raising SCs or Axs hands like 76s or A5s from co / btn. For example 3 limpers utg1, Mp1, HJ, hero on the btn 7s6s, would you iso to $30,35, 40 or over limp?