I have tried basically ALL Hex:EtOAc systems. In a university lab, so have access to anything imaginable.
Well, you've only tried one solvent combination really. Try acetone/hexane and ether/hexane for starters. Switching the aliphatic hydrocarbon for toluene can very, very helpful.
A non-exhaustive list:
Possible strong solvents: Alcohols, MeCN, THF, Acetone, EtOAc, ether, DCM, chloroform
Possible weak solvents: Hexanes, toluene, DCM, chloroform
Try combinations of different strong and weak solvents.