Legitly, no. I know exactly how you feel. I also feed my mag from lv5 to lv200 as well. There's plenty of guides at psoworld or gamefaqs on how to make the mag you want. Many times I had to switch characters with a different class and section ID to get the PB's I wanted. Here's one example: http://db.gamefaqs.com/console/gamecube/fi...line_ep12_a.txt
It only takes about 3-5 minutes before you can start feeding it and really doesn't take that long unless you are going for a defense mag. They only need to be in your inventory, you don't have to equip them.
My advice is to focus on the first 50 levels and get the PB you want (as close to the final stats as you can get it, plan ahead). Than worry about their stats afterwards. Good luck.