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If I remember right 28psi is as high as you ever want. My truck won't break 23 psi. And I really have to work on the last 3-4 psi too. Even missing 4-5 psi my truck can light up my tires if I let it. At wot unloaded I can hit 1250 egts without pushing it. And I have a full 4"turbo back.
Those are to bad EGT's at all. You can hold it there and be fine, its anything past that you want to try to keep to short spikes. When I run my 6.0 down the 1/4 mile I will work up to 1,600+ and I have done that many many times with no issues its just I would not want to hold that for long because heat soak will start to set in and that is when stuff can go wrong.
update: found out that i was running the srl+....which is for studded trucks so i have gone back to stock settings till i have the correct srl tune....no wonder is was running so good w such high psi......