There are a few problems you are dealing with. First, if the front trigger is hard to pull it's because the sear and corresponding full cock notch have not been stones to a nice pull weight.
Next you can either dog-leg the sear bar, or you can apply a spacer to the rear "trigger" blade, or you can inlet the whole trigger bar deeper, or you can apply a spacer to the sear bar. Applying the spacers requires you to silver solder or braze, and dog-legging the sear bar requires it to be red hot. So if you do not have a torch that will allow you to get the temp up to about 1300-1600 degrees, the best option is going to be inletting the whole she-bang deeper.