When you took it apart did you thoroughly degrease the inside of the recoil cover, the big isolation washer, the spring and the rope holder/pawl assembly? They must have no bar oil, no greasy buildup, no oil, no lubrication etc. They should be cleaned with brake clean or degreaser, sat to dry then reassembled.
I usually give one, sometimes two full spins of the rotating assembly AFTER I have enough tension to just barely bring the handle back in to the cover.
Do you know how to pull a bight of rope out between the rope hole and recoil assembly and rotate it around inside the groove to build more tension?