I can see why you would be frustrated , the seraph towers are painfully annoying and boring. It also sucks that even one enemy slipping your defenses means less orbs to throw are dropped , when half the time there are invis vandals running pretty damn quick off spawn into the support tower. They need to address that activity in the first place . As for trials, your SoL , it's always been a non match-made activity so I recommend just using the lfg app if you desire to play the mode , it takes just about as much time as this post to find a team with.