Beautiful color contrast, but the entire disk looks a bit onion-y (which I typically only get on the limb). This comes from not enough dynamic range in the stack, and 215 frames seems like a very low number…have you tried increasing the stack? I typically do 1000 input (Live View .mp4) frames per processed output frame. This is because I can stack 100 seconds of frames without smearing due to planet rotation, and I only get ~10 fps from my Canon T3i through AstroDSLR. The stack is certainly blurrier, but also more tolerant to stronger sharpening methods; I then derotate 2-5 processed frames in Photoshop (so 2000-5000 frames total), which further cleans up any lingering artifacts (e.g., onion, edge-rind, shot noise). The output from my stacker is 16-bits per channel, and I do all processing at 16 bits between Gimp and Photoshop. Are you processing at 16-bits?
Separately, you can use a much shorter focal length on Jupiter through an 8" SCT—it's plenty bright,so you can trade some SNR/shot noise for more pixels across the disk. I use orthoscopic eyepieces vice a zoom, and I use the shortest focal length that lets Jupiter practically fill the entire frame at 5x Live View. For my Jupiter shots on 6 July through my 7" Cass-Mak (2700mm f/15), I used a 12.5mm eyepiece. Here's the 1000-frame stack from a 100-second Live-View .mp4:
which is highly tolerant to sharpening:
which I then derotated and combined with two other output frames, resharpened, and scaled to acceptable acutance:
With an 8", you should get at least as many pixels across Jupiter as my 7" (seeing notwithstanding).
If you're not happy with the output, you can always scale down; at least then all the artifacts are smaller than the pixel resolution:
Edited by BQ Octantis, 12 July 2018 - 10:38 PM.