[Avodah] Kitniyos - Why do today's Poskim argue with the Mishneh Berurah

[Rabbi Meir G. Rabi via Avodah]

Can anyone show some Halachic source
 that argues with the Mishneh Berurah
who Paskens that
Foods containing
LESS THAN 50% Kitniyos
that is at the same time not visually discernible
Although its taste is certainly discernible,
 is Muttar during Pesach?

Is a Rov permitted to refuse to identify a Kosher product as Kosher (or
worse, declare a product not Kosher) because of other considerations?

See this article
http://www.kosherveyosher.com/chocolate-pesach-lecithin-1001.html
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