Sorry for the non reply Harry - I haven't been monitoring too closely of late... I like your moon shot. Lunar imaging is a function of focal length, critical focus & exposure duration. You need fast exposures and stable equipment to prevent camera shake/mirror flop. Most dedicated lunar/planetary imagers are using video these days, taking hundreds of frames and stacking the best in software. Never tried lunar HDR, higher ISO introduces a lot of noise which could be problematic. The attached shot was taken through one of my scopes - a 130mm triplet refactor, 1085mm focal length at f/8.35, 1/8000 second at ISO 800. Believe me, there are some amazing lunar imagers out there and I'm not in that group - LOL... Contact me off-line if you want to discuss techniques.
In the past few months I've been making some equipment changes and updating software to get back into astroimaging. I'm setting up to be more portable and simplifying things. We're under the jet stream in Maine and the sky conditions are never great - I'm close to assembling an imaging system I can transport in my truck along with with my daytime gear. I'll let you know how things progress.