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MikeUI personally have been collecting 1948-Present pricing for SGC vs. PSA sales on eBay. In the last month, there have been 6 head to head sales in the 48/49 realm. SGC has won all 6. Newer collectors are typically unaware of the truth regarding realized prices. I have attached the below link for you to check out.
http://boards.collectors-society.com/showflat.php?Cat=0&Number=1340142&an=0&page=0#Post1340142
Specifically for the 49 Bowman set, there are 3 major players in the PSA registry (Fogel, Spence and Merkel) and one on the SGC side (Stuckemeyer). I did not check the four 49 Bowman players to see if they have the specific cards you purchased in Mint condition. If most or all of the PSA guys do have the Mint versions and the SGC guy doesn't, you may fare better by selling individually on eBay with your desired minimum.
My suggestion would be to submit to whole batch to PSA for a crossover with a 9 as the minimum. Anything you get back, I would simply sell in the SGC holder. Alternatively, on the second round you could have a larger PSA submitter send in your SGC slabs with the 9 as the minimum.
Best of luck.
Full Disclaimer: I am biased as I like SGC and I help them gather realized price data.