I guess the dieseling is worse on full power?
Which to be fair I don't use on my .177.
I have a .22 Silver Star which is ok as well and I only use that on full power.
I remember giving my first .177 45 a bit of lube some years ago.
It never stopped exploding after that.
Quite scary.
Luckily I sold it to a chap who liked the BANG!