I made 1 with a iPad and 1 with a iPhone resolution.
I made the fontsize of the attributes roughly the same as the overall fontsize.
For the iPad version you could show even more attributes if the fontsize was made smaller,
on the iPad it would still be very readable.
Also the coverart is much better viewable and comes more to its right if you would show only 6 above each other.
Since flicking the screen goes really fast, 2 less showing isn't noticed too much.
In my honest opinion (and i don't want to step on anybody's toes or hurt ones feeling
) making the fontsize as big as you did makes the app look less professional.
It deserves better, since it is a very professional app