Do Lavenders tend to have less muff/beard?
If a bird only has one copy of the gene, the beard and muff will be smaller. Sometimes just a little bit, but when you compare the birds side by side you will see it.
In a way I think she answered your question. Lavender is a project color still correct? Seems like a relatively recent cross which would result in a lot of split beard/muff genes. From what I have read Lav can also have poor feather quality which I imagine would contribute as well.