Solved

Staff level 20 - 19 design poi

I thought that the design points post race where based on level of staff - they seem to have been so all the way through, however now I am at level 20 staff I am still getting 19 DP?

You get fixed DP from the design building. 
What staff influences is DP from research and next season starting design.

I hope this helps, have fun racing.

thanks Wambou!