Should I just drop Percy Harvin?

I'd hold onto Harvin, other than Garcon (who you're already trying to pick up), there's no one in your FA pool that I'd rather have over Harvin. As for the TE, I'd rather have Pettigrew. Gronkowski relies entirely on TDs, he's your textbook boom or bust fantasy option. With the presence of Aaron Hernandez and the many other options Tom Brady can throw the ball to, it makes Gronk a very inconsistent fantasy option. Pettigrew on the other hand is the sole starter at TE for the Lions and for the most part has been pretty consistent this year.