It looks like a pitch problem but I would also check blade balance. The pitch tool they sell is just ok. A better way is to take a couple broken blades and cut them off close to the hub. Epoxy an 1/8" or so plywood platform on the end. About 1" by 5". Set it perpendicular to the blade position and be sure it is level with the salvaged blade hub. Buy a couple small plastic pocket bubble levels from Home Depot. Yellow, about 3/8 wide by 5" long, $3 bucks. Set the helo level on your workbench and clamp the flybar paddle to something in a level position. I always disconnect the leads to my motor to avoid disaster. Cobble together a 10 degree wedge (bits of plywood?) to put under the bubble level. In hover, I am looking for a level bubble at 0% throttle and level bubble with the 10 degree wedge at 100% throttle. I have (2) levels so I can watch both blades at the same time. Sounds like a bit of work but well worth it and very accurate. Linkage adjustment is obviously the only way to dial the pitch.