Try some shaped polys like Kirschbaum black shark, Volkl Cyclone TOUR (I found it had a lot more power than reg cyclone) and maybe Weiss cannon 5edge. As for a multi in the cross, if you aren't a string breaker and cut out poly/syn gut because it goes dead, I'd say it wouldn't break the bank using poly/multi. You'll break it a little faster, but you probably won't have to cut it out before it breaks because it goes dead. I really recommend Volkl Cylclone Tour 17/ Premier attack at mid to lower tensions. Idk your racuet but maybe 53 mains and 55 crosses. That setup would feel great to me.
No. Try not. Do... or do not. There is no try. - Yoda
Dunlop F 3.0 Tour