I would rather flat the 3bet OOP with 65s or 76s than T9s being OOP. LAGs are going to have more 9x and Tx in their 3bet range than TAGs, and that can kind of make the hand harder to play. However, if we do choose to flat this, then we have to play the hand with some creativity. We're not going to make a hand enough times OOP to warrant playing this.
So, that being said, we could try the old "lolimanitandwaittilltheturntocheckraisemynutsbeca useidontknowwhattodo" line. Pretty much flat, and then check/raise/fold any 8, J, K, A, or spade that comes OTT. We're deep enough that we can do that and still find a fold button, plus those cards that come will give us more equity if they flat (c'mon J
)
But the best play is to just fold pre against a LAG OOP.