Bowhunter1287, 2650 FPS out of a 20” barrel would be a top end load IMO. I was getting 2710 FPS out of my 7-08 with a 24” barrel and the pedal was to the metal. What you currently have is a stout, very game capable cartridge. If it’s accurate run with it and don’t second guess yourself; my thoughts anyway.
Not knowing your OAL nor your mag length, at 2.875" the Amax bullet and 45g of IMR 4451 is compressed and at 2.875" the 162 ELD-x could and should be on the razors edge of compressed and you stated you can shake the powder in your rounds.
Please reply back with over all length. 45g of 4451 is a lot of powder to stuff in a 7mm-08 case with long bullets.
45.0gr is a Max recommended load as posted by a member here already. As another example the Sierra app shows for their 160gr TMK that at 44.9gr and a 2.80" COAL you might start seeing pressure signs. Yes different bullets but similar weight and just as a reference.
Now the powder still shaking at 45.0gr with this bullet weight makes no sense. Unless the bullet is sticking out more than recommended.
As a separate note, I don't see why the OP needs to try other bullets when he already chose what he wants to use.
To the OP, just run another test on paper and go from there.