I will give EXP a try next time. It is just that the bulk of the damage comes from red modifiers which are costly (SCA, DA, FI). With the three of them very little space is left for green/blue modifiers. Though I haven't experimented enough, I found the build I posted earlier by chance after a run where I didn't get a homing modifier and was hurting for extra damage.
I tried TRA a bit but the static bullets were useful only for enemies that chased after me. Everything else kept its distance or got pushed away by the main bullet's impact, so the trail just dissapeared without damaging anything.