The master cylinder states I can use DOT 3 or DOT 4 fluid. I used dot 3. Could this be part of the problem?
No. Are they still not firm? I'd go back and rebleed them following the instructions to the T. If they are still spongy, you can try this. Pull the brake lever by hand as far back as it will go, then tie it off in that position and leave it overnight. Helps to have an assitant. If the brakes are still weak in the morning, you need to look at rebuilding the master cylinder. Really not that hard to do, but you'll need to bleed them all over again.
Guba is right!
I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
2001 & 2004 Rebel 250, 2006 Ninja 250, 1989 Vulcan 750
Putting your bike year and model in your signature helps others help you!