I enjoyed 4G Rough as a cross with gut. Much softer than regular 4G. Tried 4G Soft only in a full bed and felt that lacked spin.Moved my brother over to gut/poly after he experienced discomfort using a full bed of Luxilon 4G in a Speed 360 MP.
What's interesting is that he isn't wearing through gut/poly as quickly as he did full poly. He consistently broke Hyper G, Pro Line 2, and 4G in at most 18 hours.
Wilson Gut 16 mains and 4G Soft crosses lasted close to a month. Played really great, lots of spin, super plush pocketing.
Right now he's trying Wilson Gut 16 mains and Poly Tour Fire 125 crosses. It's garbo compared to the 4G Soft hybrid so far.
Curious to try it in a gut/poly.
Have you tried Luxilon Element as a cross?