If you already added right thrust and you vertical climbs are straight up then I would check out the elevators to make sure. A 1/8 inch difference will cause this. I had this with my 4*40 and ended up cutting off the elevators and teisting thhem (carefully) to get them to lie flat. Once reinstalled it would track well in loops and mine did roll left but verticals were straight up.

When I built my sixty I laid a peice of wood on the elevators and covered them with a nice thick phone book and it worked out great.

As I mentioned it could be thrust...Ailerons could also cause this. A heavy wing can also cause this. but the most common is elevator misalignment

You could also download a trim chart to help you and you will learn allot just by trimming the plane. Be prepared for a lot of work but in the end you will have a great flying plane. And before anyone askes, Yes I do it to my sport planes also. It's great practice.

http://www.rcaerobats.net/trim_chart.htm