murph, I've seen many a young driver become ambitious and want to buy a route. True, you can make some $. The first thing I'd like to point out is that 4 months is not nearly long enough to see the intricacies of this business as a driver or a contractor. I'd advise going at least a year in your current spot and watch the turmoil unfold as a driver. 4 months tells me you have not yet worked through a peak. Work through peak once. That alone may break your resolve. Another thing I suggest is to go to another terminal and do some "overtime" on a Saturday HD route, and pick the brains of other drivers and contractors. You're in the system, and contractors usually need help, and Saturday is good because you're off. If you're serious, this may help you. FedEx blows, but your terminal may blow harder or be much better than others.
My second bit of advice is.... you state that you need outside investors to fund you. Which means you don't have the capital? You will be recouping that loss for a long time. The real money comes when you're not paying down massive debt. This is not a career of passion, so I fear you would be in over your head.
Last thing.... If you're serious about this, why on earth would you wish to purchase FOUR psa's? One is enough to start. If you fail or change your mind, one psa is easier to sell or manage than 4. Why not buy one and drive it yourself? That's the smartest decision, IMO.
Lawyer + accountant + you working through this peak + HD time on Saturdays at a different terminal for a few times and/or talk with other contractors ... you must do all this at a minimum to prepare yourself for FedEx. Also be aware that once you get in bed with Fred, you walk a thin line. Be prepared.