I was pretty much told that I will get 75% of my base pay which is my current rank and years of service using my retirement points divided by 360. That would make me O3E with 8 years of service.
From my 199:
Although the Soldier's disability is presently rated at 90 percent, the Soldier will actually receive 75 percent of the Soldier's monthly base pay, or 75
percent of the retired pay base depending on the Soldier's active duty entry date, unless Soldier is eligible for a higher percentage based on years of
service. DFAS will calculate the Soldier's pay using the method most favorable for the Soldier.