OK, so I've owned several late 50's RedTip SS. In general, I found these to not be that aggressive, kinda like a fatboy set on 4. Recently I acquired a '55 (A4) Redtip. Jeez, is this thing aggressive, maybe like a fatboy on 7 or 8. It is kind of cool, loaded with a feather, it is really a test of my technique (and my first aid capability ). Is this usual, did the RedTips get less aggressive with the manufacturing date, or is there that much variability within the product line?