I fly a Piper Arrow II (PA 28R 200) - have about 500 hours experience. To date, when I'm not flying solo, I've only ever flown with one passenger in the right seat - which usually puts me about 250lbs below max gross weight. I've never flown with any passengers in the rear seats. In the next few weeks I'd like to take 2 passengers on a trip ~ 100NM - this will put the aircraft about 70lbs below max gross weight and within CG limits, but it will be the first time I'm flown with 2 passengers - one in right seat, and one in rear. Would appreciate views on how different this will be - I know should expect a longer takeoff roll and lower climb rate than I'm used to, but is there anyone else I should be aware of? Just a bit nervous since I've never had this much weight in the aircraft and I don't know how it will "feel" - I've been told to increase my rotation speed by ~ 5 kts, but any other advice or views would be much appreciated. Thank you.