Spencer, Unfortunately if you have that much smaller particulate (not metal shavings) found in the pan, (probably be clutch material) it may be only a matter of time before things start to slip in clutch packs. One thing about automatic transmissions is true, heat & broken down friction modifiers (overheated fluid) without putting fresh fluid in kills them. Considering how hard trannys work, I change my Dex 6 out more often than many owners at 40k miles period. If you only dropped the pan you have not changed all the fluid (lots unchanged in torque converter)
SO here is what I would do. First off get the sticky varnish away from check balls etc (weird shifts) in valve body by using this: Trans Tune | Sea Foam Sales Company
Add a full can, drive it for 1000 miles, and see if the trans improves while it cleans and then change the fluid and filter again and see if there is more particulate matter in there.
The other product I use in all my automatic'* is Lubegard. This keeps the fluid much cooler! LUBEGARD Automatic Transmission Fluid Protectant