If you're looking for 4AK to RO, just do 4A[K] and then BT K for forward RO. I apologize if I'm coming across as a buzzkill, as I understand how good it feels to come up with new creative stuff, but it's just not very practical in this case. With 66K you can use 6A+B for the best results. Even if you do 66[K] accidentally just do G6A+B to quickly turn around and do it. (If only 4AK bounced people as high as 66K, oh well...)
After CH 1A+B you can do 22B (I think it's a combo, not sure... but it'll stop rollers at least) or 11B for wakeup options. In terms of damage though, 44B is the best option. It's not guaranteed on NH though like 2A+B is, so I tend to just stick with 1A+B, 2A+B to keep things simple and consistent.