There is no real need for PCT if you are on TRT, and neither will you need one if you do a blast. However, you still need to use all the proper ancillaries during the blast, which would be aromasin for estrogen, n2guard for the liver, and cabergoline in case you will use a nandrolone, such as trenbolone or deca. If you will use all the proper ancillaries, there should be no problems with gyno - at least it should not get worse.