[Wez (Wesley Lamont)]

Here is my second noob question following on from my Primary Mirror assessing and cleaning. My scope is the Skywatcher 16" Dob.

I currently have a Baader Hyperion Zoom eye piece (as well as the two plossls that came with the scope but aren't really worth mentioning). I am currently trying to keep my light path in 2" as much as I can.
- The Baader zoom + 2 inch extension tube in the Telescope can achieve focus and all is good. Planets are still white shimmering balls so from what I could find going for more zoom would be a benefit.
- I purchased a TV PowerMate 4x. Initially I could not achieve focus with the powermate and the Baader zoom with any combination of Powermate then extension or vice versa.
- I talked to the astronomy store from where I bought the scope and they suggested removing the tube on the Powermate and the extension tube entirely but that was not successful
- By chance I finally did get focus when I was pulling the zoom out of the scope noticed I could get focus floating further out from the actual scope. So that lead me to get some extensions (Baader Locking extensions).
- During that purchase I also got a coma corrector (Baader again) so now I've got the Coma Corrector, 2 extensions, Powermate, regular extension tube and finally the zoom lens.

So that brings me to my question. Is there a way to work out the best focal length? Is there any recommendations on using the combination of the equipment I have in a particular order that is recommended. Every post I found regarding the Powermate just had it sitting in the tube and the users stating it just added magnification. Something I have never been able to achieve.

I'll add the photo of my various bits as well since its likely hard to comprehend just through text.