The VA disability/Vets preference for GS jobs is what it is and probably not changeable in the immediate future. If you are pursuing a GS job, either research or take a seminar on exactly how to apply through USAJOBS. Your resume containing the key words that the scantron is looking for determines greatly where you fall out in their 3 tier system of candidates. Bottom line is you won't get interviewed unless you are in highest tier.

Worry about what you can control.