sorry mutha, didn't read that too well
maybe your maxle needs adjusting ? (unless this is what you meant by doing up really tight)
You may well know a lot more about this than me, but…
the threaded end with conical tip can be wound in (just like on a QR skewer) & this should cause the "expansion" to be greater when you flip the lever (I assume it's something tapered being dragged furhter into expandable housing). It's also possible that the inner bits are kacky & need a clean – might cause failure to slide over each other properly?
I have BULBs, seem to work fine with a maxle