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Firstly, by all means keep using your SCT, but you won't get shorter exposure times, at f/10 it is very slow photographically. Being alt/az you are limited to 15-20 second subs before star rotation rears its ugly head. An f/6.3 reducer
would help things immensely, but are not cheap.[assuming that you don't already have one.]
It would appear that your polar alignment is not good[judging by your pics],
or something is slipping during the exposures.
Using the 55-250mm lens the stars should be round using 40-120sec subs.
raymo
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