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Ken, It might be worth trying to bring the load center distance closer to the polar axis by using a side by side plate for your guide scope, and also considering something small and light like the Orion ST80, weighs about 1/2 what an ED80 weighs and for guiding is more than adequate... The 190 MN is F/5.3 is it not? given the focal length, you could reduce the weight much further by dropping the guide scope in favor of a modified finder scope with your guide camera mounted in that... It should be more than adequate for guiding your Mak Newt, and weighing in at about 300g, much lighter than a guide scope..
I used to have an EQ6 heavily loaded with a C11, piggybacked ZS66 guide scope, 4 counterweights, and all the other miscellaneous doo-hickies that go along with that.. It finally hit me that I was getting average results because I had far too much weight on the mount, I then moved to an off axis guider, removing the piggy backed guide scope, the piggyback scope rail and a few other bits and bobs and the results started to flow in...
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