I used to paddle one, and miss the \"pig troff\" as it got nicknamed, canoeing is more about slowing down to get through the rapid dry is better than charging. Try keeping the hull flat as you may been edging too much and as you take the blade outthe boat will automatically carve in the directon of the lean. Practise Practise Practise.
On the rolling front, I found once the outfitting is snug I found that a screw roll worked really well, and for extra support, scull the blade back to the front to finish in a forward position ready for the next hole/ rapid etc
Have fun I may have to get another fly and join u in the 'Pig troff parade'