I don't mind the turn/river play, but I also don't think he's folding an ace very often.

The problem I think is your range vs what you're trying to rep.

His weak ace loses to a strong ace, but based on your preflop play he probably doesn't put you on an ace thats willing to felt 3-streets like this.

His weak ace loses to a 7, but based on your flop call you likely don't have this (I'd imagine you'd raise a 7 on this flop since he'd have a hard time believing you? ... which may be why sauce is advocating raising this flop)

Maybe you got there with 88, but thats pretty unlikely. Also the paired board probably makes him think he's worst case chopping with most of your aces, since its unlikely you have many aces better than A8 due to preflop.

If you think he can believe you slowplayed a 7 here, then I don't mind it.