Re: New brake pads and old discs
New pads should bed in almost immediately; fifteen miles is more than enough.
It's difficult to diagnose without seeing the problem, but it may be that the pads are not fitted correctly - possibly even the wrong pads? Another possibility is that the new pads are 'harder', i.e. lower friction level than the old ones, in which case the pedal pressure for a given retardation will be higher.
Whatever the cause, if you're not happy with your brakes, take it back to the place where the pads were fitted & ask them to get it sorted - you can't compromise on safety.
Where are we going & why am I in this handcart?