I mostly like Rival's sparring gloves (RS1) except for the thumb, and their pro fight gloves are pretty great, except for the terrible leather on the palm side of the gloves.
Their bag gloves are pretty gimmicky for the most part. I had these d30 and gave them to a kid who needed a pair of gloves, mostly because they didn't correctly. What oz gloves do you compete in? For the most part, I would say that bag/mitt gloves should not be less than what you fight in, though I personally use 6-8 oz bag mitts for bag work, but I don't compete anymore. Also depends on what sort of bag work you're trying to do. If you're working on endurance (by endurance, I mean amateur endurance, doing 3 two minute sprints where you try to land as many punches/more punches than your opponent), technique, or power. I use the bag mitts which have no wrist support for technique and power. I switch out to my 18 oz gloves when I'm working on endurance. I don't think you screwed yourself with those gloves. They're pretty nice, and the wrist support is flimsy and gimmicky, but it might actually help you with your technique as you'll probably torque your wrist if you throw without accuracy.
It all depends on what you're working. I don't have terrible hand problems, but I've had wrist problems, so I actually went with really thin bag mitts to improve my technique and wrist strength. Seems counter intuitive, but it's been working for me.
I don't think Amazon will accept the return if the gloves have been used/soiled. I think for things such as boxing equipment, they will only accept if there are minor cosmetic blemishes. They are unfortunately expensive, but I think they're decent gloves. If you want to throw full power, I would suggest making sure that technique and accuracy come first. Make sure you're not leaning into the bag, and make sure you're rotating your hips to generate power.
I don't think you'll ever find one glove that satisfied all of your needs. Winnings are a pretty awesome glove, but they don't work for me on the bag as the padding deadens my blows, not to mention the fact that the padding breaks down relatively quickly especially in comparison to latex heavy mexican gloves like your cleto reyes, which are pretty damn durable and have great leather, but the shape is not the best. Nice record by the way!