(A) Googling,U-tubing and internet buds are not substituts for inexperience. Chances are the people you find lurking on those places know less than you and will give advice that get's you in over your head.
(B) The ONLY ballast that should be on tractor for traction is wheel weights/liquid in tires and front suitcase weights. Heavy pulling while fel or hoe is mounted can and will severally damage tractor as in break,bend and warp things. Having both on tractor is asking for trouble. That you don't realize that by simply looking at it is scary at best.
(C) I suggest you get 3-4 snatch blocks,3-4 short chains w/hooks,a long cable with hooks and duplicate the way come-a-longs multiply force. You will learn more about mechanical advantge than you could ever hope to surffing the net. Here's a simple but effective set up to get you started. You will figure out more as you experience how they work.
NEVER hook cable back on itself because it will ruin and/or break it. Throw a short chain around tree then hook cable to chain. Connect high on tree as you have been doing then go to base of another tree with cable through snatch block. Cable from snatch block to drawbar and tug away. That arrangement give's max traction but no mechanical advantage. To give 40 horse tractor 80 horse muscles,anchor cable at base of a tree to high on subject tree,through snatch then back to base (or a secound base) through snatch then to drawbar. Unless trees used as anchors are to be removed eventually,protect bark with tire tread or the like. Good luck and I leave you with words my mechanical mentor told me. You can propel a train with a lawn mower engine using gears.