Slight inner tire wear

[ohhh my]

My question is about tire wear.

I have an 03 boxster S with aftermarket 19 inch wheels, lowered on eibach springs and blistein shocks. The car has been aligned but there is a little bit more tire wear on the inside than the outside.

Is this normal for a sports car? Or should there be perfect tire wear. Also, since tires cost so much, I figure it would be worth while to have my tires flipped to increase tread life, thoughts?

Thanks