Well, on those other builds, I suspect there was already damage by time stiffer valve-springs were installed. Also not using aftermarket programmable EFI system is major issue. Having 3D ignition-map programmed for boost is much, much more reliable and durable than trying to gimmick factory 2D RPM-based ignition map.
Since max VE for new-gen is tuned for mid-range, that's where most of your power-improvements will be delivered anyway. So yes, stay out of high-RPMs for safety. I'd say set redline @10k just to be safe.
Do you have intercooler?
What max-boost levels are you using?
Mind posting your maps? I'm collecting everyone's for references. Might put together a DB of some sort.
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