New Moen 2570 (m-pact posi-temp) acting funny

Hi all - we just finished a great bathroom upgrade (a leak forced our hand). We have a new Moen 2570 valve for our tub/shower combo. But the temperature regulation is super wonky.

It's freezing until you turn it all the way over to the hottest setting, then it's hotter than comfortable until you turn it almost all the way back to cold. After that it's doable, but colder than we'd prefer. It's like the heat only has 3 options and there isn't any scale or in between spots.

Any ideas? Would appreciate it so much! Thanks, Matt

Are the hot and cold lines plumbed correctly? You may need to flip that cartridge 180 and try again. The handle should be at 6 o’clock and turn ccw to 9 o’clock

Thanks for the reply, Dave. I'm 99.9% sure they're plumbed correctly. We had a licensed plumber install the valve. The handle starts at 6 (cold) and goes counter clockwise to 9. It makes a distinct noise when it goes past about 10 in either direction like it's blocking or unblocking the water from cold (that's the point when it goes from luke-warm to full-hot).

Another thought - is it possible it has something to do with the stop valves on the sides? For the life of me, I can't find any documentation about where those should be set.

SOLVED! That was it. I found this: https://www.moen.com/customer-support/faq/faq-122
Both stop valves were at random angles so the pressure was low on both sides. I don't think there was enough pressure to trigger the cartridge normally.