OK, I'll try to explain a little more.
What you do when you make statements like "In a neutral park, I'd guess he'd have an OPS between .780 and .880 in most Worlds. A decent enough bat, though probably not quite enough for a full-time 1B" is set unrealistic expectations. You've admitted that you'd like your 1B to have an OPS that exceeds .881. So would I. So would everyone. I'd like 8-9 players to meet that standard.
But, as I pointed out, only 4 1B in MG qualify. So 28 teams are going to fall short. The OP's team might just be one of those teams that has to "settle" for a 1B whose OPS is a meager .791. Which, as you pointed out, will put him right around the middle of the pack in a MG-equivalent world.
In short, everyone can't have a superstud at every position. Offering advice that suggests one should only accept players who would be in the top 10 percent of the world is just plain silly.