If you have the clone editor, you can change Common>Power Saving> Mic Gain to +6dB.
If the radio's serial # is 6H - 9H, send it in to the repair depot at no charge for the ceramic filter TB201206-4. Just need to make sure they know you want the Tech Bulletin upgrade. If not, you will be charged for flat rate if not covered under warranty, for other parts they replace.
Pros: Free, New Ceramic Filters for better NB sensitivity, Firmware updated, and Realignement
Cons: Shipping, cosmetics not replaced (front case, rear case, belt clip, etc...)