It shouldn't, because the system now permits the CoC to monitor the distribution of grades, which was always impossible with a paper system. In theory, at least, CO 1 Blankshires can now be directly advised by MS that 100 "O" grades for LCpls from his Bn is a little over the top!
How that will work in practise is beyond me, but I have already noticed that ROs are much more circumspect about awarding anything other than a B - me included!
As has already been mentioned, it is the script that is important - not the grade.
Irrespective of grade, did your 2nd RO say you were in the top third? Board members pay little attention to grades but what your CO or 2RO writes. Boards run on average three candidates for every vacancy. If your 2RO says "top third", you're in with a chance of picking up. If he says you're middle third, you might just make it. If you're "bottom third", do not pass go and collect Â£200. Bear in mind that a Board may have to score between 150 - 200 Cpls on a Board. The may have time to read your latest SJAR but they might just go straight to COs comments for your latest SJAR and prior 2048's. Overgrading is still a problem hence why the written word is crucial.