While we have tranny fluid changing post interest here , here are some thoughts:

When I change out the filter/fluid, clean out the pan , drain converter, blah blah....blah..button it up, etc..
I then cut the old filter open and take a good hard look... and wow... some of them are BAAAAAAD , with everthing from clutch material to metal fillings.. so..
If the filter was not too bad , I let it go and consider the job done....
But if it is bad, I run the car for a week or two [ maybe 300/400 miles] ,
and then I drain it again.
...both the converter and the pan...and I take the pan OFF AGAIN [ you got a new gasket, so no sweat here].---Not just the drain plug. [ this allows you to wash the pan again.. and there will be stuff the first fluid change carries out of the valve body.clutch surfaces, and cavities you did not get the first time]
I do not change the filter this second time , as I feel it has not had a chance to catch much yet.
The cost of 7/8 more qts of fluid are cheapo insurance and so far , I have saved a few trannies with this extra effort...you just can't over clean your tranny .....