Need help with brahms capriccio op116no.3

[gruffalo]

I am stuck. in bar 9, i cant move my LH 345 very well whilst holding the E flat. i have tried hard working the 345 and trying to relax the arm, wrist, hand etc. but i am still way to tense and the 345 is not even at all. the fingering i use is 1(held on to the Eflat through most of the bar) 234 5432. i have tried extra slow stacatto, going deep into the keys, holding all notes whilst exercising each finger, keeping close to the keys, repeated 3434343434, and 4545454545 practice whilst keeping the thumb held, and it still doesnt do anything. please help! i need to record this for something on thursday.

Gruff