Base your decision as if you were UTG+1 as there is a player with a M=1 to act after you; just ignore him, im mean I know.

I didnt yet had the time (Lazyness is definitly -EV)  to calculate the M you need with specific pairs, in different positions, to make an open shove +EV.

Until I do so, I use a graph that indicates for every pair, in every position, the probability that somebody ends up with a bigger pair than mine; as those are the hands against which your equity is just awful (18%).

In your case, with 88 in UTG+1, there is a 18.9% (1/5.3) probability that a player still to act wake up with 99+.

The rest of the time you either pick up the blinds or ends up playing for stack against high cards (AK,AQ, maybe AJ) as a slight favorite, or against a lower pair (most likely 77) as a big favorite.

 Its a tough one, but since your gonna go through the blinds next hand, and that I think some players call your shove with 77, I would open shove.

I dont like making a normal raise as some bad players will flat you with junk, and put you in tough spots on flops with overcards.

Shove all day