Chaos Falcon Wing Cape or leave it clean?

Scrolling for DEX implies its the ratio of DEX:attack, which seems to be about 5 for you so a 7 att gain is about the same as 36 dex gain from renegades 20%. (Also, not sure but that number for attack seems low to me, you have to include skills (80 attack for BM with 30 blessing I think?))
There's also the option of chaos scrolling the first slot(s) nicely and then using renegades scrolls.