UBr (MD post #3574) question - SB ideas/strategies with UR crap?

sadly I found out its my worst match-up I'm frequently confronted with, it potentially represents the same clock Burn could and still has those random Spellsnares, Fows and Snaplocks or ... I found I just can't read their hands and play efficiently
All games I've ever won were just they played badly or drew real nothing and still it was close...and its even worse with Extraction and Pillar...

I have tried
3x Empty the Warrens - which is too slow unless played T1, T2, totally random ...and is even worse MD as suggested some time above
3x Defense Grid - which is kind of ok, but underperforming in other matches

usually with 3x +Chain of vapor for pillars/delvers/warrens

I'm currently on 3x Pyroblast 1x EtW -1xAd Nauseam, -1xPreordain, -1 Therapy, -1xIsland and ignoring the Pillars... better but still not good...

3x Pyroblast
2x Empty the Warrens
3x Extirpate
2x Pyroclasm
1x Virtues Ruin
2x Chain of Vapor
1x Echoing Truth
1x ? metachoice (Hurkyls Recall/EtW/Infest/Wipeaway/Sadistic Sacrament)

so the question is SB: 3xpyroblast/3xgrid/3xother?

Opinions/experience using Nihil spellbomb as a Snap/GY hate?