If you think you are off after what they send you, then there is nothing wrong with changing your appraised value. Nothing at all wrong with it. The VA and the lender are your client and it is all clean. All documented, not like if you can meet this price, I'll send you assignment.
It's the same way with FHA. The lender and FHA are your client.
Let me clarify, the SAR, even if they work for lender as employee or the RLC are only people you can discuss your appraised value with. You can't discuss your appraised value with a loan processor or a loan officer or anybody else that works for lender. You can't discuss appraised value with homeowner, real estate agent, builder, etc. That is confidential information between you and your client(s).
On the other hand, that is where an ROV and Tidewater help for people that don't have your experience and knowledge. You can explain it in report. If you need to change value, that's fine.
You have to do a revised report with new signature date regardless on an ROV that you get and explain the results.