Tuning for injectors

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I have been running PHP tunes for about 2 years now. Everything has been great. I have finally saved the money for a set of stage one injectors. The current mods are intake, exhaust, gauges, intercooler, built trans.

So my truck is mainly used for towing. Typical load is approx. 10k. I tow on a very regular basis. Last night when I was coming home I paid close attention to my gauges to see what all was going on. On the long grades egt would stick right at 1100 degrees. Boost was right about 15lbs. Trans was in drive not overdrive. Cruising about 55mph with 9 k behind me.

In my mind I would think that adding extra fuel would allow my egts to be to high. Am I right in this thinking? Or does it come down to tunes? I just dont want to drop 1500 bucks on injectors and tunes only to have power that I cannot use.

Truck is a1996 f250 7.3 211k