So what are the things to watch out for in this surfing technique?

Sir!

Yes, Shiranui.

Don't jump too high!

Correct.

It's the same when surfing a wave

in naval combat, the basic rule is that your feet should be in contact with the sea surface.

I did it, poi!

Flying high is okay when you want to vary things up

Poii!

but while you're in mid-air, you're basically not able to change direction or move around.

Don't forget that it's easy to be defenseless when you're being targeted.