Im not the right person to suggest this, considering that I'm about 500 points below you, but I think 10. Bg5 would force trade of your dark-squared bishops if your opponent were to play f6- therefore, they should refrain, and the move shouldn't be played by them.
LUCKY - Quick turnaround
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I didn't play this game well at all, and was a pawn down and looking in trouble, until what seemed a slight error from my opponent gave me a surprisingly strong attack.
2 reasons I post - the main one for some tips on my useless opening (I always play French positions badly, as find defending against a black f6 with a fianchettoed bishop very difficult), also for how quick the position for black deteriorated without any massive blunders (I was shocked anyway)