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Sorry that is annoying to have 3 scores that are so similar.
I honestly don't think it matters a whole lot. I don't think schools do much with the sectional/raw scores.
I would say you can submit whichever you like the best or feel it compliments you. If you have a strong quant background, consider sending the Q50 or Q51 to demonstrate your strong side though Q49 is not bad at all per se and is quite reasonable for any finance/quant person. There is not all that much of a difference per se and I don't think any of these scores will decide your fate or have any impact on your admit decision as you will be evaluated as a 730 applicant.
Thanks
It has been extremely frustrating and disappointing! I kept hoping I was going to get at least a 10 point bump but I only had a short time to retake each time. I'll just use both Q49 & Q50 for Wharton