I too have a low arm speed problem in that I have a shoulder that prevents me from putting full power into a throw. One thing I've discovered is that to a point, the faster the disc the lighter I like it. My drivers are 150s, mids 165 and putters 175. Ultra light (135) high speed stuff is great if your form is right and the wind is low. HTH
Am I the only one who thinks vegetables are a butter and cheese delivery system?