This is probably a dumb question, but I'm curious. I am planning on shooting a 125 Bear Razorhead (old model) with a 50/75 grain insert for deer next year. If using a carbon arrow and assuming blade size and diameter is equal for a 125 and 200 grain bh (may not be possible in some cases), what difference is there between shooting a 200 grain bh and a 125 grain bh with a 75 grain insert? Why not go with a lighter head and use inserts to add weight (especially if looking for smaller blades)?