80% prg by weight will end up being almost completely prg. Not a high quality lawn with prg when it is nearly 100% of the stand imho. Not sure where you live but cold winters can result in significant prg losses. You could also stop watering and hope the new grass won't survive the rest of the hot summer. Otherwise it is difficult to overseed into a prg lawn (if not impossible)

Thanks! Yeah, that's what I was afraid of. I'm in north Utah, so hot summers and fairly cold winters (usually). The only other potential saving grace is that after 2-3 months it's still fairly thin in some places, so if I stop watering it just might make some room for other grass. I did reseed the bare spots with bluegrass some 3-4 weeks ago, but still early to tell of that did anything.... sigh...

My mistake...not completely PRG but close. Over time any KBG you have will become a greater % with each passing year.

https://turf.purdue.edu/tips/2009/08102009_grassmix.html

Thanks again. So it sounds like there's hope... I also checked the original mix again and I was off. It's 40% PRG, 20% Annual ryegrass, and the rest is an even mix of rescue and KBG. As long as it will eventually darken up and blend with the rest of the yard, that's fine. I was just a but nervous seeing it come in and look so starkly different than everything else. Sounds like after a few years it will probably be okay, which is fine with me.

More than likely, it's the annual ryegrass that you find offensive. Most of that will be almost completely gone next year.