The main reason I don't like concentrated blast OT rockets is that it's basically a more expensive stock AP. It has WAY more power than the stock AP...
How much fuel were you adding? ANFO explodes at OVER 60 units mixed at once. Adding 30 fuel to 60 ammonium nitrate(poly+ammonia) makes 60 ANFO. So if...
Use research vials. They hold 30 units each. Although I'm not sure how useful that'll be, since I haven't messed around much with various foams. But...