Dear ebookLuke, first of all thanks a million, this extension is great

I just succesfully completed the conversion of a file full of graphs, formulas and tables - I was sure it could not cope with all this, in fact I have been proven wrong, all has gone through.
There is one problem, though, namely that formulas come out very very tiny (in practice, they are unreadable - I am using Calibre as an ereader, since I am still waiting for an ebook reader): is this a known problem, or is tehr something I should change in the conversion settings?
Again, many thanks!