Fuel surcharges would be the main ingredient for deciding if you want the 60/40 split or 40/60. If they're high enough to manage your fuel, and make a small amount to boot, take the 60/40. Otherwise, save yourself a headache.
For special services with Panther, I was told $1.70 (that's with the fuel surcharge). If you decide on 60/40, ask Panther what the total with the surcharge, per mile, will be.
To get into special services, we had to fill out a 27 page application. However, luck had it that we didn't have a chance to apply. Now, it's an even lengthier process, with Panther having to pay 5000 per driver to get them qualified (background check, etc.). If you aren't sure if you'll pass the qualification, talk to Mike about it. And only get into it if you're serious, as they have pretty high standards. They might make you drive for awhile before letting you apply.
Good luck on what you decide to do.