Could it be?
It sounds strange when you say that the mainsheet barely reached the tube. The tube is to be set about 90 degrees to the mast, but suggested to be a bit more such that it's angled away from the mast base towards the mast head a few degrees. Otherwise, in my case, the mainsheet blocks will actually touch before the there is enough forward pull for the mast to be up all the way and attach the forestay. (A bit of an exaggeration but you get the idea).Anyway, if your pulling on the mainsheet tilts the tube forward and down towards the anchor well, the jib halyard is either slipping or not tied off at all. It should be attached to the cleat on the side of the mast so it doesn't move at all (other than a bit of stretch).As others have said, I can raise and lower the mast with one hand (but use two for the first couple of feet off the crutch if there's nobody around to impress ;-).We can't over-emphasize what others have mentioned that as the mast goes up you must make sure that the turnbuckles and toggles that attach to the chainplates are standing vertical above the chainplate U-bolts. Otherwise they bend, become unsafe, and you'll need new ones. Mine were all bent when I bought the boat used. I mentioned them but the dealer sluffed it off. That salesman no longer works for the dealer, I might add. I probably bent them even more my first season. Now I know better.There is a picture on this forum somewhere that shows a platic cable tie treaded through the fore and aft toggles of the upper and lower shrouds so that they stay more vertical and don't flop over. If you can picture it, when the turnbuckles are vertical these wire ties make an oval loop of few inches to bind them together. If you can't picture it, try the photo forum or seach the archives. I have some ties in my bag and will give the idea when I raise the mast next time. I took it down to replace some lightbulbs, straighten the windex, etc.