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Hi Marty, welcome to IIS!
With that size reflector, you won't see a whole lot more out of Saturn, but the view could improve with the following:
1) Collimation - every newtonian owner needs to know how to do it!
2) Seeing - if the seeing is good you'll get a better view
3) Altitude - make sure you view it when it's at its highest. It's pretty low in the north for us, so wait until it's over 35deg at least.
4) Better eyepieces - while you didn't say what type of eyepiece you're using, if it's the standard ones that come with those scopes it's not likely to be the best quality.
Having said all that, it's always worth having a 2x barlow. That way you can use it with your 15mm to get increased magnification.
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