I was wondering what factors control string tension? My custom guitar's strings flop and dont feel very nice if its put in anything lower than drop-d. However my friends metal guitar feels perfect when its put into C. What controls the string tension?
In your case; string gauge. Your friends guitar has thicker strings.
scale length also plays a part in the string tension
tuners do to, if you have tuners loose, you will probaly not even have the tention to tune the guitar