Thanks!
The rear beam has really been an improvement in the handling! The front setup with the combined compression struts and arb was less good. It's either the strut of the arb taking up the force from braking. When putting extra struts like these on the purpose is that the struts should take the force from braking. But since they connect a bit lower to the chassis than the arb the anti dive is changed and the car dove a lot more during braking. I've removed the struts now and I like it a lot better, during braking the car dives much less.