YES, You reduced your DELI
You will be getting 400 returned 7 days after the changes you made.
Now your 400 is in limbo for a week, due to your mistake.
To get where you want to be you need to make the total say 600 SP
Try this link, it works best for everyone I know....
https://steembottracker.com/delegation.html
You do log in thru steemconnect...
No math to do, you enter in SP and it does all the math for you, no calculating "VESTS" or "M-VESTS"