Your snake should first have ample time (at least a week or two) to adjust to it's new home before attempting to feed it. That would also include not handling it. It needs to be made to feel secure - and that's helped by wrapping the tank sides with black construction paper. A few other things you can try is 1) leaving the pinkie with the snake (near the mouth of the hide), and walk away/leave it alone with complete privacy 2) gently crack the pinkie's skull with tweezers or pliers before offering it.
I invested in a temp gun (around $12 at Amazon), and always insure my feeders are between 95 - 100 degrees F prior to offering.