i think the plant has under gone a little stress due to the transplanting. i am sure it will bounce back after a few days. i would just make sure it is watered well and cut back on the nutes as you could be causing more harm than good with to much ferts.the dirt alone has everything the plant needs, so relax and give the plant a few more days and it will come back and be just fine.
may i asked why you would transplant just to move up a gallon in size?