Is my Tabac jealous ?

[QuarkVI]

Hi,

Haven't been wet shaving for long and have mostly used Tabac without any hassles. A couple of weeks ago I got a new Omega boar and some MWF.

Well since then I have had a couple of shaves were the Tabac lather has totally collapsed on me i.e. disappeared into the ether. I bowl lather but this happened in the bowl and on my face.

I did have a couple of failed lathers with the Tabac and MWF when my brush was new but have washed it thoroughly etc. which sorted that.
Could there be something in the MWF that the Tabac doesn't like ? Would too much water do this to a lather (as I know MWF takes more so I might not be adjusting) ?
or is it just poor technique ? Hasn't happened with the MWF yet. And I do rinse my brush in warm and cold water between shaves.

Really frustrating because I am one of the crazies that loves the smell of Tabac and enjoy it when I get it right.

thanks
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Robin