oil out of breather under hard cornering

[zx_volcane]

Anyone like to shed some light on this?

Took zx out on track, and it decided to puke oil out of the breather hose - admittedly just floating in the engine bay

Made a mess, but only lost less than 500ml

Have not been able to replicate it since, even giving it absolute death on the way home / motorway.

Putting it down to hard cornering, as its spattered before after some spirited country rd driving.

So I've either overfilled it in the first place, or something else is causing it to throw up under hard cornering.

Any suggestions beyond fitting a catch tank?

Am I ok to leave the oil level on the lower side of the dipstick? Best procedure to measure level beyond having it on a flat surface, cold, hot ..etc