You can switch if you want. If the shrimp is dissolving, you should be seeing some ammonia though.
If you are going to use a bacteria product to speed things up, I always suggest Dr Tim's One &. Only. It absolutely works when used properly. See their website for details. Takes less than a week for the tank to cycle. I've used it three times now and had the same result every time. By the end of a week, you can dose to 4ppm ammonia and its down to zero in less than 24 hours. That is the ideal to shoot for in cycling, using any method. I've heard mixed results on other products.