Well the arguing percentages for DoD, is your call, if you have other conditions that could/should be deemed unfitting then you should fight. The pay is based off your top 3 and either your percentage or Length of service x2.5 whichever is higher. So if your A E-6 or 0-3 or higher it can be close once reaching the higher percentages.
The other things to consider are, DoD once out unless you contest it, never change ever. Va ratings are "safer" at 5 years but not secured until in place for 20 years, and can be dropped without examination in that time frame etc. just by sending you a letter and you not getting it/not contesting it.
Keep in mind pay wise, once you hit the door, under the VA kicks in which can take 4-6 months, you will be receiving your DoD rated pay. The higher your rating or LOSx2.5 of your "high 3" is the higher that amount will be up to 75%.
Personally speaking, IF I was at 50% or greater AND 100% VA, I would not contest anything DoD, unless a glaring error etc. was present, unless that difference was very significant. So if you have no other conditions that would be considered "unfitting", then you are probally safe just pressing, but if you had say a bad back and bad knees and they only rated the knees and back would give you 40% more etc. then I would fight at the FPEB to have those things added.
Again, I stress this, that is my personal take, only you can decide what is justice for you and what you feel comfortable with accepting.