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Bojan,
I've used many (!!) SCT over the years, mainly Meade - 8", 10" and 12" and it's only in the past eight years or so that I actual moved to Celestron and the EQ6 mount (for spectroscopy)
The mirror slop/ flop is much worse in the Meade design and I had to fit a mirror locating screw (MAPUG design) this worked "Ok"
With the C9.25 and later the C11 I found the slop/flop problem to be very minor and didn't affect my focus/ guider (I use a Lodestar on a "on-axis OAG") what can and does make a difference is to run the focuser through the whole travel a few times to re-spread the grease on the baffle tube.
Needs to be a regular part of the observing technique......
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