Im keeping it 15 weeks. Like you said 2 weeks isnt that much of a difference and from what ive read its best to run EQ for at least that long. Also weeks 13-15 im upping the dosage of test to 900mgs a week.
by uping the dosage just those two weeks i doubt you'll have any more growth than you would at 600mgs! and yes get hcg, i WILL NOT run any more cycles without it! it makes shyt soo much easier on you during pct. im a true believer now.