well for collecting 20 000U / H u need to have atleast 31 PP in Uridium ( not all U PP) , pet lvl 10 ( max. waste of fuel) doubler, and spearhead , using PB bot.
for x7 SK and BSK am using on both config. 4 BO2 in drones and rest is lf`s , full speed, that makes me around 9 000U/H.( Kbot/Ibot)
for x-4 and x-3 am using full speed 3 BO2 and rest lf`s ( any ship best leonov) and the 2nd confi full speed full BO2 this make`s me around 5k - 7K U/H. ( Kbot/Ibot)
am talking about msb 25 and plt 2021 on x3-4 and x-7 with eco.
(but am full lf4 lvl 14)