The 4 send values can be individually set for each row, but not for each step. I'm not too sure there's a way to record the automation. Because of the way m4L works, u can only record a max device's audio by routing it to another track first and by then the automation data is lost. U would need to be able to record directly to the device's track to be able record the automation with it, which isn't possible unfortunately. I know this isn't ideal, if i think of a better way i'd definitely do it, but for now really the best way to record sends while you're playing is by routing their output to another track (or tracks) and record the audio there.
Next time u drop in a file and u can see the name but not the waveform, save a copy of the set and pm me a copy of the .flist file. That would help me to see what's causing the issue.