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Paul,
I do get a slight cast, I believe this is due to the slightly different refactivity of red and blue light, though that is only my assumption. I don't think you need an apo barlow. I start with just the ToUcam and get it as close as I can see, then pop in a barlow and repeat. I've tried it with a second barlow (unfortunately not a very good one) but if the seeings not very good it's just a mess. I was reading the other night on CN about this process and it was suggested that seeing needs to be pretty good to get it spot on. I've had a bit of a search over there but I can't seem tofind the thread now.
As for seeing the spikes, maybe try upping your gain and brighness a bit then reducing it after you've slewed to your target.
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