I dunno about reversing a 190A8 fast, from what I know about it, it wasn't exactly a nimble a/c; powerful as hell and deadly too but, a fast turner?
Use of a hammerhead in the face of nme is not a good idea IMO. The FW 190A8 is best fought at speed, with its best rev move being the split s or roll. There are certain E moves that work well in a 190 but, I wouldn't rate the hammerhead as one of the best. As I think has been pointed out in here, an nme with E is gonna blow yer arse to kingdom come if you got yer nose pointed up and yer speed is down around 100kts