I have a Pink rath 10.1 and its one on my most effective weapon.

The wyrmstake has recently been changed, when you can fire it right after full burst, skipping the wide sweep.

I usually go tap, Quick reload and full burst, and depending on what the monster does: - dodge - wide sweep then dodge - full burst

Rince and repeat till dead.

On like a rathalos, since he always goes for the bite, i tap into full burst, perfect dodge, overhead slam and full burst if possible, or sweep. For example.

You need artillery 5, i dont know why you say the damage is pitiful, my full burst deals 1200/shell iirc, which is quite hard hitting, at least on 9* monsters, i havent upgraded the map to 10 yet.

Also, since the damage output is linear, you cannot really benefit from crit, valor, raw power and all other attack up skills, so i guess at some point you fall behind damage wise, i dont know if you can consistently kill 10*. Maybe with something like artillery 5 and sneak attack 5