I'd try an Air Hawk. Seems like the dimensions of the stock seat are exactly what you want (alternative can't be closer, higher, or narrower) so it's just the elusive comfort you're after.
If the Air Hawk doesn't work, resell it and have a custom shop mod your stock seat - change the foam, reshape it, add gel, whatever you need to feel more comfy.
I've finally outlived my immortality.
69 Sprint SS350 "Sophia"
07 FXDB "Tramp"
08 XL1200L "Pedro"
09 FLHTC "Trusty" Sold despite the naysayers
09 FLSTF "Jock" New need sig pic now