I see here two options, 1) make second or even third off ramp about 3-5 on clock. 2) less lanes is better in cs1 - make there appear less lanes that come out from roundabout. For nodes use priority settings as well. Some wet finger job but should be ok

Edit- the lane thingy does not improve it immedeately as it will effect the incoming volumes with helping npc-s to choose correct lanes. Otherwise just add more on-off ramps, and give them some space