Hi DooMMaster,
I encountered the same issues as you but when I understood a little more about fonts and the conversion process I found this is (in most computer applications) the norm. Fixed width fonts (and perhaps height) don't typically reach a large size. I wanted fixed width and height so I converted and modified my own. It's about 30 pixels high and from memory 28 pixels wide and only includes numbers. My application was for a GPS clock.
Here's a link to a photo with the font: U8glib Custom Fonts GPS Clock | I used FontForge, Fony and b… | Flickr
When I have access to the code I'll update it and paste it here.