I think the whole "60mph" things is weird though....
I mean, if it's just about rpm then why not 2,000 in first gear? (maybe try that...)
Next, I'd be wondering about Boost. Could you have a leaking IC Boot maybe? Not developing enough pressure from the turbo would do it too.
The 1211 is an ICP code, is that what you replaced or was it the IPR? In either case, those are expensive sensors to just "try". The problem might actually originate with the HPOP pressure or a HP Oil leak but, with your mileage, it would be less likely than others.
Here's the thing, if you plan on keeping this truck for awhile then you should invest in the tools to diagnose it (we need specialized scanners). The best choice is the AutoEnginuity w/Ford Enhanced package ($350) you add an old computer. If you have an Android device there is much useful information available from the "Torque App" (you add a BT adapter - search here there's a lot of info) (>$50) but not nearly as good. I would do one or the other and learn how to use them. You need something to monitor the sensors (like the ICP & IPR) to help you figure-out what's going on, now and for the future
For now, if you need this resolved right away I would suggest getting it diagnosed, even if you have to pay for it, to save you from spending any more than you already have for something you may not need. On the Free side, once you get the tank low doing something like the Hutch Mod, to eliminate the clogged screes, might be a good thing to try now anyway.