4.2a Beta 5: Font baseline problems

In the Default font, at the default size, there are still problems with certain letters not lining up properly with the baseline. Capital T and capital i are major offenders, as well as lower case w. Sometimes they shift up above the baseline when you enlarge the font. But they rarely seem to line up quite exactly:

Here's at the default size (I've drawn red horizontal lines one pixel away from the base of the letters so you can see how they aren't lined up):

Here's that screenshot zoomed in so you can see the discrepancy better:

Now here's that same titled with the font enlarged to 3 notches to the right of Default size (notice the T now looks like it's above the baseline):

That same screenshot zoomed in shows that it's probably just because the base of the T is too light. If it were more solid, it would make it look lined up with the other letters:

This problem has been around since the pre-4.0 beta days. I'm wondering if it's ever going to get fixed. I find it quite distracting when I'm reading.

Perhaps it's something that is outside of Logos's hands, but maybe the devs could work with Microsoft to get them to fix it in WPF if that's the case.