Do you know of any good checklists available for this?  Set names and card lists?

You can do that now with search by adding keywords.  For example "pokemon" brings up tons of results.  "pokemon games" will be only video games.  The "games" portion limits the results to only that category.  You can do the same thing with the genre.  "pokemon systems" or "pokemon games controllers" will show only results for that genre.

I've added those two 25 card pack variants now.  Thank you

I added that Traditional Chinese set and card.

https://www.pricecharting.com/game/pokemon-chinese-as6ac/mewtwo-&-mew-gx-208

What is the difference between the 25 and 5 card pack cards?  I am not seeing any difference when I look at them.

Sorry for any problem. I've asked servers to revalue and recount everything. That should be done by the time you get this, but sometimes takes longer on really big collections. Sorry for any inconvenience.

Can you send photos of those two items so I know what to add?  

What you describe should be the expected behavior.  My guess is something odd is happening with your account. Please let me know your user ID or user name on the site and I will look into this and fix it.