These days, going RB3x is a viable strategy, especially since (as you noted) there's a dearth of good RB talent.
I wouldn't call your WRs "weak" by any stretch. Dez, Garcon, and Wayne are all #1 receivers and will get their looks. True, you don't have a true top-flight WR1 like Welker, Wallace, Jennings, but your guys are respectable.
The only thing I would worry about is going up against teams that have solid guys and a few "superstars." I don't see any "superstars" yet on your squad. You could very well meet up with a guy who has similar WRs, but has Ray Rice and Stafford, or something like that. Charles and Richardson are great, but CJ needs to step it up to make this a championship team.
Take a look at mine? viewtopic.php?t=516228