You will get mainly onshore winds at Kuta and the West side at that time of the year, so whatever you do you are probably going to have to head to the other side of the Island, Sanur, Nusa Dua etc to get some nice clean offshore conditions.
If you are only planning on getting out 2 or 3 times I reckon you may as well just do a couple of day trips across to Sanur, get in touch with Jankie, hire a board off him and he should be able to advise you what might be the best days/times/tides and point you to a few fun waves nearby.
www.bali-standuppaddle.org/supschool.htmlor you could give these guys a go, particularly if you want to try to surf closer to where you are staying
www.supwavehunter.com/