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Hi Chris, that's looking pretty good for 150 sec subs, but I think 100 iso is a bit low for your camera, 400 iso is probably as low as you need to go with a canon DSLR.
I'm not sure if you can get guiding perfect and consistent unless you have a permanent mount in an obs. The longer the focal length the more little things will start to affect guiding, you have to keep checking for any movement in your imaging train and tweaking the balance.
Balance is the biggest variable for me, some nights I get it all just right and the guiding is perfect and others it is all over the place. You have a pretty long focal length to tame but perseverance is the key, I have marks on my mount, counter weight shaft and ota so I can get consistent balance each time I set up.
Rick
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