A .46 on a 9.5 # plane is too under powered. Yes, a 61 is a good choice. The .46 lacked the power to overcome the wind resistance on the tail section and that is why you had problem turning into the wind. However, if the wind is strong enough, a bigger engine may not have helped. The wing dipped as you were in a cross wind and the wind was trying to flip your plane. When taking off in a cross wind, if you have to, use the ailerons to dip the windward side, the wing that the wind is blowing from. In other words the windward side will dip instead of rising which can then flip the plane over. Full scale pilots also do he same.

I regularly fly my float planes on windy days and have to watch the tip overs. On my 10 lb Cessna, I use a .91 4 stroke. Others flying the same model had good luck with .61 2 cycles so you should do fine with a .61 also.