The 1/2 shift under acceleration may be normal, depends on the torque converter, the looser the softer, the tighter the harder. The 2/3 flare is most likely the band releasing to soon. I'm not a fan of the TG kits in the OD transmissions. Use a flat blade screw driver and pry the band apply lever down and see how much gap you have between the lever and the servo. You only need about 1/4" minimum. So start there and adjust looser if you get a little binding.