I'm still pretty much a newbie and I don't have enough data points to really say it with authority, but I have found that shrimp are MUCH more sensitive to acclimation than fish. With fish, I match sg and toss the fish into QT (after temperature acclimation, of course). I've never had a problem with this method with shrimp. But I've done this match and drop acclimation with shrimp and they usually die in a day or so (for me, at least) -- these were cleaner shrimp). Nowadays I don't drip acclimate shrimp, but I do it batch mode (temp acclimation, then dump bag into hang on container, add cup of tank water, remove cup from container and repeat once every couple minutes) and try to be finished in 15 minutes. I've found the batch mode works better for shrimp than simply matching salinity and dropping it in.