door and rocker problems

[72BBB]

Ok guys i had to replace both doors on my 72 and first i ordered goodmark doors and that turned out to be really bad they were 3/8 inch too big so i sent them back and picked up some used doors. The rocker panels i got are from key parts and when they are tacked in and the stock door is hung the gap on the bottom of the door and rocker is not right. The gap is good in the back than gets tighter towards the front causing the door corner to hit and the door hits slightly on the inner rocker on the front curved part. Should i buy different brand rockers or modify the rockers??