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Was #7 one of the injectors you replaced?
It may be that the solenoid on that particular injector is internally shorted and it only shows up on load (longer firing time for the injectors).
I'd suggest checking the resistance across each injector solenoid. Measure between the center pin on each VC connector and each of the 2 pins closest on either side of the center pin. I'm guessing that you'll find #7 quite a bit different than the others. A normal solenoid should measure less than 5 ohms, but significantly lower than that (say below 2 ohms) would indicate a problem.
The other thing to check is where the engine harness connector goes across the driver's side valve cover. The Engineers (not so wisely) put the high voltage injector circuits on the bottom of the bundle where they'd be the first to chafe and short out. Maybe some electrical tape will fix your problem.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check Here
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