Personally I think it's all about the flick.
I have 150 that I use for those quick right hand turns...I use heavier weights when I need the disc to turn later in it's flight. I have also heard the Venom is a great disc for it. Typically a disc that is super overstable is what most people use. Being though I ONLY throw discraft I am unsure of how Innova or other companies disc work with the thumber/tomahawk. I have also used a Crush...and my Predator. Whatever you do if you are going for a specific thumber/tomahawk disc makes sure you get it in Z plastic or Champion plastic...no matter what kind you get make sure it is the most durable plastic availible. That is the main advice from me.
When you say tomahawk disc how far are you throwing and which way is the wind coming out of. I think these are very important factors. If Kyle Pinkman hasnt spoken yet find him on here and ask him. He is by far one of the best overhand throwers i have seen ever. I like throwing firebirds myself but do good to throw 250ft overhand shots, therefor I do not throw them that often.