Back to the OP and his original post...
Welcome to BITOG! You've had a pretty good taste here of what it can sometimes be like.
I really like this video a lot, it seems to fit well here... I have a lot of respect for this guy. He is up in the Chicago area.
We have a 2006 F-150 5.4L for a work truck where I am at. It has a rough life. About 135k miles I think. It sometimes goes to the dealer for OC, sometimes quick lube places, sometimes gets forgotten about for quite a while. No noises or any issues yet...
My $.02 to the OP FWIW...
The M1 is going to do just as well for you as the RP and leave a few extra dollars in your pocket. I think that you would do just fine with 5k OCI. A Fram Ultra filter would be just as good for you as well; perhaps a Wix or Napa Gold too; again, and save you a few bucks.
I respect your diligence in taking care of your vehicle. I think that it will continue to serve you well for a long time to come.