If swapping out some trackage doesn't work, you can try altering/staggering the joint configuration. For instance, if you have two 10" straights in a row, you could use 5, 10 5 and that may help.
And you could try swapping the switches around, too, to see if that makes a difference.
If the switches are still an issue, try directly connecting the pos/neg rails on the track next to the divergent curved turnout to the pos/neg rails on the switch with clips and see if that helps when you run the engine straight through. You can keep mixing and matching this test with all 3 tracks that connect to the switch. If it helps then you can hardwire one of the tracks to the switch to increase connectivity.
And what Joe said, plus slightly bending the center rail tabs to make better contact with each other,
