I finally got around to calling today. After an initial conversation with a customer service rep, I was transferred to a different representative. I told him I was unhappy with the rate increases for royalties, internet radio, and 2nd radio discount. He said he understood and offered me 50% off on both my subscriptions. I accepted, got both radios renewed for a year from today, and got a $19 credit based on what was left on my existing annual subscriptions.
Not too painful. Probably 10 minutes on hold for each rep and 30 minutes total.