have you tryed the Swedish Army Trangia burners??
they are somewhat larger and in the cook kit with the
windshield that is made for the smaller burner the army
one will bring a pot of water to a rolling boil.it however
will not fit in the space for the small burner and has to
be set on the ground....i'm still working on a way to fit
the big one in without cutting the windshield up..