Re: Brake bias settings
It is only normal for your front brakes to be hotter than the rears. The harder you brake, the less brake pressure is fed to the rear axle in a bid to avoid you locking up at the rear and end up back to front. With modern cars these days (even more so front wheel drive cars), nearly all of the braking is performed with the front brakes due to weight transfer to the front axle during a braking event.
The only thing I can think of about your poor brake performance with your new discs is that you might not have bedded them in. It takes a good 100 miles with repeated gentle braking to ensure that both pads and brakes start performing as they should. If this is not the case, you may have an incompatible set of brakes and pads fitted.