EVERY time I have encountered grabby front brakes.....the root of the problem has been that the rear shoes are out of adjustment and doing none of the work.
An easy way to tell if that is the case, push the parking brake several clicks and try the pedal brake. This will spread the rear shoes outward and give them some stopping power. If you find that corrects the issue, you need to figure out why the rears aren't self-adjusting.
Most times, you'll find that the self-adjuster star wheel is corroded frozen. Replace them if that is the case. I found the best deal in the world is the brake kit at AutoZone. Something like $6 for new springs, mounts and adjuster.
Another tip is to regularly use the parking brake, since that actuates the self-adjusters. Another tip is to drive in reverse and apply the pedal brake vigorously, several times. That will also keep them adjusted.
Note that the star adjusters are side-specific. Putting a Left on the Right wheel will cause it to loosen instead of tighten. You would not be the first person to find that "problem".
