Originally Posted by Maestro Ramen

Assuming that you get the soft landing, then you will lose everything under 300XP no matter if it's 25XP or 250XP. To get a bit of carryover you'd need to work your way through the 149 gap (your better half is right - they always are), and only what's between 300-600 will be carried over. It doesn't seem like a very attractive proposition so in that case I'd wait for your renewal period to start doing MRs.

Assuming that you don't get the soft landing, then trying to hit 180XP before your end of renewal is indeed the smart way to go as you'll only require 300 to qualify for plat as opposed to 480.