Hi Phil,
I have an EM-1 I've been planning to use on a scope and your posting caught my eye. Well done. You have a lot more data in that image than you may think. There are plenty of people with better claims to image processing fame than I but I thought I might just give yours a bit of a push around with Photoshop in the hope that you might feel able to have another go yourself. It's all part of the learning curve.