Can I also add my two bobs worth - try spraying the internals of the furler with silicon spray. I had a similar problem - the furler was tight to furl, so I blasted the furler with silicon spray, and now nice and easy to furl by hand. Even my wife can hand furl the genoa.
I presume the furler received little preventative maintenance in the 8 years prior to my ownership, so this becomes part of my routine maintenance schedule.
With regard to adding additional winches, I move he original ST40s to the rear mounting positions on my B37CR, and installed ST50s as the primary winches. There are alloy backing plates under the mounting pads, that I drilled & tapped to secure the winch base plates. And yes definitely use a lanolin or silicon grease to isolate the stainless steel bolts from the aluminium.
Tip for removing stainless mounting bolts from mounting plates: use a battery powered impact driver, with correct fitting drive head. I use an 18V makita impact driver, and it works every time to remove previously "impossible to remove" screws & bolts.
Steven
Konan the Bavarian