I am running mara with 8/8 t1 and broken tooth, with fire res.
Works fine for me.
Tinkerer is cake.
Princess is either tanked by the pet, while you outrange her toss, but still staying in pet heal range.
Or just normally kited.
Rotgrip is easy as well: Send in your pet, start with autos so your pet is abled to build up some aggro, then when rotgrip is around 70-80% just burst him and you'll pull aggro.
He is gonna get hit by the trap you placed before and you meele him, until you drop low.
Then fd + new trap, pet attacks him again.
Get some distance and burst him down, you should not pull aggro now, since your pet has a lot.
Done with 20/31/0.