You didn't say specifically what part of the door is keeping it from
closing without a boost, but...
Can you live with the looks of just trimming off the parts of the door
which touch/drag and keep it from closing?
If everything else is solid, the hinge screws are tight, etc., but the
structure has sagged or shifted and caused the problem, then trimming
the door may be your easiest solution.
I have sometimes found to my embarassment after removing the door and
planing it that the problem was due to a loose top hinge which causes the
door to sag downwards... you may want to check this before planing the
door or shimming the frame.
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