rig manager max out?

What does the warning say? Can you post a screen shot?

1001 rigs is the max number you can have saved on your profile.

it means you have maxed out the memory on your profiler. You need to delete some of your profiles. You can move them to a local library on your computer through RM.

The Kemper will only hold 1000 profiles and 125 performances

There is no need to have so many profiles on your Kemper. Do a backup, then remove all the ones that you will probably never use. You can go back to them again later through Rig Manager. Test them via RM by double clicking them. If it's an amazing profile, THEN, and ONLY THEN, do you store it to your Kemper.