The G system has the same problem – its Tap Tempo sends CC#19 messages in latch mode, Eclipse wants its messages in momentary mode. So BPMs on the Eclipse will be 1/2 the BPMs on the G system.
I get around this by using a dedicated button on the G system floorboard to send CC#19 in momentary mode (it has this option) to the Eclispe, which sets its tempo – then send MIDI Clock back out from the Eclipse to the G. Annoying but it works.
What the Eclipse needs is a (TRIGMODE) parameter for the general purpose externals (#1-16) not just the "dedicated externals". There's room on the 3rd hotkey on the page assigning the source to the externals.