Getting to 3NT seems worth a try. Do I bid 3♥ or 3♠? Generally I understand that if there are two suits in question we show instead of ask. I could, after all, have a similar strength hand with a control in spades but not in hearts, right? Of course if my spade control were the King, that's not much of a control if partner plays the NT, so maybe I just bid it, but if I have the ace of spades I might be worried about hearts, right?
Anyway. 3♥ or 3♠?
I am a little embarrassed to say what happened here. I chose 3♠, lho doubled, partner bid 3NT, and, in his turn lho doubled again. Now I had to decide whether I had misled partner by my spade bid and he thought I had the stop. I'll spare you the gory details of what happened next.
Partner is a pick up, and a bit on the hyper side, but forget that. What is your agreement within an established partnership?