Hello Dave
Your set up sounds much the same as mine, although I have a made-to-measure stainless steel tray made up locally to catch the chips and errant fluids (lubricating oil in my case since I don't use coolant).
Assuming the Myford tray is flat bottomed and can't be engineered (beaten into submission) to provide the required fall, I can think of two possible options:
Adjust the level of the stand so that the coolant flows in the right direction. Easy enough using leveling feet (hopefully of the vibration absorbing variety). However you would then need to shim each end of the two Myford mounting blocks to bring the the tops back to level before mounting the lathe.
Option two would be to buy a smaller SS tray from the local cookware shop and place this under the lathe bed to catch the bulk of the coolant and have a wipedown of the main tray at regular intervals.
I favour the second myself, but as I say my only issue is with lubricating oil so I omit the secondary tray and only go with the main tray wipedown.
I will be interested to hear what other solutions pop up how you get on.
Pero