Processing ideas for Jupiter

I just sorted through 400 frames taken on 2/19, these are the best 4 stacked in Registax then some unsharp mask and blur in Photoshop Elements. Is there any other processing that I could be doing to help pull out more detail, or just keep trying for clearer images to stack and better seeing conditions to use my 5x Powermate?

Scope Info:

LX200 f6.3
Ultima 2x Barlow
ToUcam Pro (in manual mode)

Perhaps someone knows of a Freeware download that may help so I can avoid purchasing Photoshop 7.0 for now ??

Thanks for your help,
Dark (and Clear) Skies to all,

Tom Tolla

Attached Image:

Not quite freeware, but much less costly than PHotoshop are Paint Shop Pro and Picture Window Pro. They are more or less Photoshop clones. Also look into Mike Unsold's ImagesPlus; that was written with astro image processing in mind.

Ron Wodaski

Did you ensure your collimation is perfect?