Tubeless road wheels won't pump past 80 psi I bought new Bontrager Aeolus XXX TLR Tubeless Road wheel set and had them put together by A Trek bike shop. They supposedly put in the right amount of sealant but when I pump them up past 80 PSI they immediately decompress back down to about 80 PSI . I rode them at the 80 PSI and they felt good but the rear tire down to 40 PSI at end of 60 miles. 

One thing I worry about was the bike shop guy insisted on putting the O-ring on the valve even though the instructions specifically said to remove the o-ring for road tires. The reason I took it to the bike shop was I couldn't get either tire to seat. 

I was going to add more sealant but didn't know how much to add since I know there is some already in there and didn't want to deflate the wheel fearing the bead would fall off.
Road tubeless tires have a pressure limit of 80-85 psi (depending on who you ask). I'll admit I'm surprised that this limit is self-enforcing in this way. 

The fact that you're losing so much pressure in the course of a ride is obviously problematic—the air is getting out somewhere. I don't think you'd be losing that much air through the tire walls. If the tire walls are very porous, you should see a fair amount of sealant weeping through too, and you may need to add sealant until the weeping ends. There are kits for inserting sealant through the valve, if/when you need to do that. Is it possible you're "burping" the tire and losing pressure that way?

Seating the tires often requires a fast inrush of pressure into the tire to pop the beads past the "shoulders" on the floor of the rim; there are special pumps and pressurizable canisters for this exact purpose.