First off, don't limp preflop. I'm not sure how spread limit affects a game but I can't imagine it changes what should be a standard fold from UTG w/ a weak suited A. Weak suited Aces are for late position and the blinds, even if you don't expect anyone at the table to raise preflop.
Past that, I would go ahead and raise the turn. If you flat call and UTG+1 folds anyway, then you accomplish nothing. Plus, if you check the river and UTG+2 checks, then you lose value. But he's not going to fold to a raise on the turn. Then you lead the river. This is all dependent on your read of both these players. If you are almost positive UTG+1 will call behind, then go ahead and flat call, then lead the river. And if you have reason to believe UTG+2 will bet one more time on the river, then you can check raise, but you need to be fairly sure.