Hi,
1. In that case you can also try the inclusions by category. That will allow results from that specific category only.
2. Yes, exactly. Anything in the bracket “[ ]” syntax is only displayed if all the fields inside have valid values.
3. The only thing you can do about that is to disable the plugin until you finish the setup for ajax search pro, that is the safest way. You can add temporary FTP access if you want to, I can try a fix on the spot as well.
4. By default everything is 100, yes. Bulk editing to 90 is a very bad idea. Individual priorities are good for cases, when you have only a few items to prioritize. If you want to prioritize a larger number, you can also check the group priorities.