I've taken to always lighting the silents at the outer burner dome after burn-off of the spirit. This is easy with an adjustable, but with a standard silent you do get a little puff of vapor between the pumping and the ignition, unless you have three hands helping. But love that kero smell anyway.
This solves the underburning problem, and another as well: on some silents it's just plain hard to get ignition with the preheat meths, quite aside from the underburning issue. More distance from the point of ignition than with a roarer, by quite a margin.
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