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Frank you will only find out the best guider exposure times through trial and error. Some people use 2-3 seconds others use 5 sec and so on. It really depends on a lot of things including the accuracy of your mount, guide star brightness as well as the seeing conditions (easy to set the correction time too short and chase the seeing for a horrible result). My times change to suit the conditions and what the mount is doing. A good mount will need few corrections, a crappy mount will need a lot of correction. Have a play and see what works best for you. It will be interesting to see how you get on using an OAG on the RC...you have plenty of backfocus to use up in any case.
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