Goo,
Common reasons for your rear brake symptoms:
old tired brake fluid or excess air in rear brake line.
solution: flush and bleed rear brake line.
oil or brake fluid on rear brake pads.
solution: replace rear brake pads.
weak seals in rear brake master cylinder or caliper.
solution: rebuild or replace.
As for your front brake feeling a bit mushier after you replaced the front pads recently, I imagine it is a simple matter of bleeding the brake lines. This is probably what the dealer did to tighten up your front brakes when they serviced the bike previously. It is easy to let a little air in the line if you crack the bleed screw to release caliper pressure to allow room for the new pads.
Others may have ideas.
Best luck,
John Downs
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