The Yamaha Black steel series props are not POS's, they are simply another alternative to use on your motor. A black steel prop may or may not be the best match for your motor. Consult with the Yamaha performance bulletins, other owners here on CP, and your dealer. If you are still having problems get in touch with Parker.
If you decide to do some prop testing, try eBay as a source for props. I have found new in the original box Yamaha props for less than $100. Trade them with friends, sell the ones you don't like. Settle on the best for your situation and keep a spare onboard the boat with another castle nut, washer and key.
Folks often get a new boat and blame the prop for all kinds of performance problems. Compare to the performance bulletins and unless there are significant issues like Mr. Anderton's, don't be too quick to jump on the 'Holy Grail of Props' train. My own experience was similar to several others when my F150 did not rev up beyond 4900 rpm when new. After break-in the motor gained about 200 rpm but it became apparent that a change in props was necessary. I ditched the Yamaha polished steel for a pair of black steel props, each one having different characteristics, yet allowing the motor to come close to maximum (6000). I have been satisfied with these props, even though they don't look as good as the shiny ones. Other owners of the same boat (2120) and motor configuration did not have the same results and preferred the prop i had originally. Too each boat its own prop I guess!
If you are really starved for reading material you can check out my own web page on this at:
http://home.earthlink.net/~streagle/PrkrProp.html
I ended up using the 15-1/4X15 most of the time and using the 13-3/4x17 as my spare. Both yield excellent results for me but the larger diameter handles better at cruise in the ocean, which is where I do most of my fishing.
A lot can ride on how a boat is used, loaded, driven, etc. Testing different props is a drawn out process but can yield significant benefits. Good luck with your search.