Just found your post.

I got 1 Msi armor with micron and 2 with samsung and I'm seeing the same discrepancy.

I'm actually having very little luck in getting the samsung ones over 30mhs... Past 2020mclock they start throwing hdw errs.
Meanwhile, the micron one blasts thru at 31mhs with 1180 cclock 2150 mclock and 850mv super stable no errs.

If you don't mind could you share the samsung strap? was it just a 1750 copy to 2000?
How can you run them at 2250??? one of mine bsods at 2150 the other just throws tons and tons of hdw errs

Mine are all MSI Rx 580 Armor 8g OC. Are yours armors or gaming?

you can review my findings here:
MSI RX 580 Armor 8g OC (Micron vs Samsung) - issues with Samsung

stock
micron was 27mhs
samsungs were 26mhs