You don't need to install a jiffy reefing system, just get rid of the blocks in the boom and go with two line reefing, separate lines for the tack and clue. That is if those blocks are the problem and I would say they probably are. Takes quite a bit of force to pull line through that many sheaves. I assume you've run the reefing lines back to the cockpit
My boat is set up for triple reef points. I've got 3 clew and 3 tack lines led to each side of the cabin
top aft. The 3/8" tack lines go to the stbd side along with the main halyard. Have an Anderson 12st winch
for the main halyard but could have gotten away without that winch
if I'd run the Halyard to the clew side of the cabin top. The topping lift
and clew lines go to the stbd side with an Anderson 12st winch to tension the foot of the reef. Went with 7/16" line for the clew because I make long passages and chafe can be an issue with a reef tied in for weeks at a time.
In your case, to go with two line reefing, you'll need to rig a separate set of tack reefing lines or go forward and hook the tack to the boom. If you run the tack lines back, you'll need a set of blocks to turn the lines to the cockpit
and a way to secure them at the aft cabin top. No winch required. The tack lines pull the reef tack down easily and secured with just arm strength. They primarily take a static load once the luff is retensioned and the strain is taken on the clew so you don't need large blocks or line diameter. Fairleads would probably work on the mast at the gooseneck and 57mm blocks on the deck
to turn the lines back to the cockpit. You could go with only a single cleat on the cabin top but I chose to use a Schaeffer triple line clutch
set for 3/8" line.
Pull the clew reefing blocks out of the mast and run the lines from the boom, through the clew cringle, into the boom as now, out the gooseneck and back to the cabin top. Probably will mean you'll have to buy new, longer clew reef lines.
You've probably thought of it, but what about taking the load on the topping lift
as you shake out the reef then release it when the halyard is tensioned and pull the clew/boom down with the mainsheet.
If you chose to go with doing the reefing at the mast, a single winch on an angled down mount on the mast below the boom will work. You could probably do this with your current
set up as you could feed the reefing line into the boom since you will be standing there.