On my #42 ejector, the handle wouldn't move after the ejector got warm - even then, cold, it was very difficult to trip. I was thinking, how is it possible for a bale to push the tab at the pan.
I took the cap off where the dial goes on (hope I'm describing this correct) and cleaned/greased the 4 spring loaded pins the spool moves against. Reading the manual, it is an annual service as I recall. Anyhow, once I cleaned and greased everything, it kicks everytime.
However, I'm not out of the woods, I've got a fair amount of "hum" from the system. At first, I thought it was in the tank and now I think it is at the pump - or maybe both. The hydro fluid and filter are new, but very warm to the touch. Won't burn you, but you know it's hot when baling.
Some of the noise I think is just the belts running across the flywheel and on their backside on the idler at the pump. Whatever it is - the kicker is working great; concern is 2nd cutting and/or next year, the pump or something else goes out.
But back to the OP's question - I had success getting my ejector to reliably kick everytime by cleaning/greasing the 4 pointed/spring loaded pins that the spool pushes into when actuated.