I didn't know Stingers came in a 150 option.
As far as removing the bleeders, I know a 2 blade will maximize penetration potential, but at the cost of hole creation.
Yup, 150's are new this year. Cabelas are the only one's that I know of that currently have them available. I got three packs of them about two weeks ago.
As far as the 2 versus 4. Many individuals will shoot nothing but 2 blades. There are debatable variables for each. Personally, I'd leave the bleeders on the stingers. I believe they are only 3/4" wide, so the penetration effect shouldn't be all that much.
The phantoms do have a much larger bleeder then the stinger. Both are great heads IMO. But I have had some trouble with the blades loosening on the phantoms, they are some what noisier then the stingers also.