Les,
I have no experience of Massoth at all, so can't comment on that, but two LGB EPLs can be run off the same switch if you have sufficient power availbale from the supply. THe 52750 booster would help here if you had one.
That said it is best to run just one at a time, espcially if you don't have a booster and as I said before I am sure your switches can all be made to work if you use WD40 or switch cleaner and work it in by repeated switching.
James