Extraction-to-P2 setups always have some difficulty in matching extraction rates and the resulting P1 production rates required to keep the P2 factories fed. This is likely due to differences in relative abundance of resources. Looking at that setup, with both extractors right on top of the main facility, I’m guessing there’s a large disparity in the extraction rates of the two resources.
Props to you for keeping those links nice and short.
I’ve always found my best results from doing Extraction->P1 then shifting to a factory planet to crack up the higher grades.
Obligatory repost: Meph’s Magical PI Setups for the interminably lazy