horrible strategy my first go. I even went with 2 Enchanted Brooms (both rare ninjas) in my lineup, and both were destroyed, and Bloodtusk was at full health again by the time my 3rd pet came in. Either you need to specify a breed other than ANY, or this is a bad strategy. :(
I am also a bit confused as to what issue you're having. This strat has never failed for me in the 8 months I've been utilizing it, even in the event of unlucky crits. Enchanted Broom only comes in ninja breed to my knowledge.
Are you positive you're using Wind-Up and not maybe Clean-Up? That's all I can think of to where any issues would arise..
Easiest way to beat is to use Zandalari Kneebiter and Darkmoon Tonk. Start with Kneebiter and do Black Fang, Blood Claw and one turn of Hunting Party, switch to tonk and then do either Shock and Awe or Ion Canon depending on how much damage you need to do kill crawg. I used Shock and Awe once to kill him.