I think with the addition of the smoke system you have a increased the wing loading beyond what it should be. It's a small light plane and it should be kept that way, there is not alot of wing area. I have one with an OS 52 and I had to add tail weight to balance so I can only imagine how much you had to add. Then you have added a second battery, smoke pump and a tank, yeesh that's a lot of weight. Take it all out, rebalance it and you'll see how well this plane flies. Save the smoke for a 90/120 size bird.