I'll get that off to you today.... I've included a PDF for you.
These sophisticated builds can be tricky, and that is why the initial load of an OS, I believe, should be done on a freshly long-type NTFS reformatted target SSD (or test HDD). Clean installing is a whole other topic, as is conversion of a clean W7Pro64 properly licensed build (which can still be W10Pro64 updated from MS, gratis).
So, the best-practice approach would be to have no other drive than the target attached to the motherboard, and the optical drive. Update and set the BIOS settings before the build...... you can either use replicated setup from the cpqsetup.txt file I'll send, or hand enter from the PDFs.
I avoid big thumb drives for this type of work..... I use 8GB fat 32 formatted thumbdrive. The .txt file is tiny. It goes on the top level of the thumb drive (not in a folder). You don't boot from the thumb drive..... You cold boot with it in place during the boot and you just F10 into BIOS and go down to Replicated Setup under the first tab. Never use a USB3 port if you've added that.... only USB2. I always use the top front one, but USB ports mounted on the motherboard directly are supposedly the best to use.
My advice is to simply try these BIOS settings first. Then maybe you'll need to try a clean install if you have a spare small SSD or small HDD. I think you are close.... to have a processor functioning for BIOS boot but not for OS boot does not make sense. I think your OS build is missing something needed for this new processor to boot into OS. I've seen stranger things, for sure.