Do you get longer casts with smaller flies? Why didn't you like your 9' rod? Could you cast farther with the longer rod?
What kind of line are you casting the bass flies with?
It's difficult to troubleshoot casting without seeing you cast, but it's possible that your rod/line combination isn't up to casting large, wind resistant flies. Or, you're not getting enough line in the air to load the rod (especially if the cast is only going out 12').
If you're casting big -#4 thru 01+ size flies- especially wind resistant hair bugs, foam sliders, big poppers, you may need to up grade to a heavier rod (7/8 wt) and a bass taper fly line. When you shop for the rod, try a 9 footer and see if you can adjust your stroke to it; I find shorter rods harder to load and harder to find a good stroke.
If your flies are sized to the rod- smaller profiles in size 6 and smaller- try water loading the rod instead of false casting: Lay 20 plus feet of line on the water and use the surface tension to load the rod when you pick the line up. You should be able to get some more line off the reel on the back cast, then shoot a bit more on the forward cast.
Also, short, stiff leaders: 6-10 feet of 20 or 30# stiff mono to turn over big flies. PM if I can help.
I also recommend the Northwest Flyfishing forum. Friendly site with lots of good info.