i got a shavemac #177 23mm and i cannot get it to lather up my tabac cake very well but when i lather up a cream it explodes and gives me 5 times what i need what am i doing wrong because with my other brush i can get a great lather with my tabac.
I'd say try the water trick like Matthew suggested, and don't forget to really load that brush on the soap. A softer brush like a standard-loft Shavemac silvertip will need a little more time to pick up enough soap for a 3-pass shave.
And as always when having trouble lathering, try experimenting with different amounts of water and product. Usually more is better, but there is a point where it's too much!
Mostly it's just about practice. Stick with one brush and one soap for a month or so and you'll master them both!