Specifically, what new set up are you leaning towards to give you a lower swing weight?
@Dartagnan64 is correct. For me, either thin smooth gauge poly in the cross with thin gauged poly/gut/syn gut mains, or go back to full bed syn gut.Probably thin gauge poly. That's the lightest string bed you can get.
I think, in general, string density goes in order (for the same thickness):
natural gut > poly > multi > syn gut or kevlar
Happy to be corrected.