What i did wrong today (Patreon)

So yesterday i borrowed a 3004 Expert Drum from Jobo to try if this would make my 8x10 development process easier. i was afraid that my Simma roler would not handle so much chemistry. U need approximately  750ml for 4 sheets 8x10 film.… BUT problem was that the flow of the pouring the developer was too slow in relation of the development time (7:30). So i need to make a weaker dilution and prolong the development times. Next test tomorrow!