RE: Filton Extra 260 Mini
Hmmmmm.....I'm not sure of the specs of your motor Arrow, but I had an Edge 540 with a 50" w/s. Flying weight was about 32oz. Iflew that plane with a Rimfire 35-30 motor, 10x7 prop. That motor draws about 35 amps, 372 watts at full throttle on a 3s1p 2550ma LiPo. That plane flew very fast.......
Sounds like you are overpropped with those draw numbers, and a 1300ma battery might be too small.
Try a smaller diameter prop with more pitch and see what your numbers look like.
Also, what kind of flying are you doing? Are you going to hover? Or do you want faster speeds? What's the kv rating for that motor? My Rimfire is 1450kv, so it turns a smaller prop with higher rpm's. You need a motor with a lower kv rating if you want to turn a large prop, it all depends on the type of flying you want to do.
Larger prop with a shallow pitch for hover/slower maneuvers, smaller prop/higher pitch/higher rpm's for more speed.