I would personally recommend a full playthrough on amateur, and then farm sp in Ch5 of Chris' campaign for infinite ammo, defense lv3, and firepower lv3. Then when you play through on pro you can just run through the chapters and only fight what you have to. All my chapter times were completed in 18-45min depending on chapter using this method. I don't know if this exactly answers your question, but it may help. Almost forgot to mention to not use health items when possible because of the checkpoints. Save those herbs and sprays for the bosses.
Last edited by yearsinthemaking05; 11-05-2012 at 03:56 AM.