I'd 3-bet AK oop (almost) all the time. Against a standard TAG you are ahead of his range. If you only call, then check/ fold any missed flop you are leaking money.

I sometimes 3-bet all-in with AK oop, sometimes standard 3-bet.

Try to get an idea of what his 3-bet calling range is as this will give you and idea of how to play him post-flop.