Try Lubing
I noticed that it bacame harder to raise my main on my 32 Vision. I was huffing and puffing just like you. I went to West Marine and they recommended some lubricant. I had a budddy raise her up as I sprayed the slides. It was fixed, went up like a drean from then on with an occassional re-spray. An electric winch would be great, but I have other things I would rather spend the money on. Another quick note, I raise my sail from the cockpit, One day I had another experienced sailor on my boat. When it was time to raise the main, he went up to the mast and started pulling on the halyard from the base of the mast. I was completely shocked on how easy it went up. He pulled as far as possible and I gave her a few wraps on the winch. Hope this info helps, Good Luck.