Your issues are with the VZW LTE network, NOT your phone. Look around the Razr/Maxx forums and you will see that they have issues w/ 4G as well as the Bionic folks. Its just something that comes along with adopting new tech, there are going to be bugs. The 905 update helped with my 4G issues, and the ICS leaks have been better, however I know VZW has expanded to almost all of Mass and southern NH, so I know that helped out with my signal drops.
Also, why would VZW give you a different phone? You have had it for 11 months (assuming 12 month Moto warranty) and now, just before your warranty runs out you are going to try and scam a new phone from them? Look, VZW is a bunch of scumbags with their business practices, but that doesn't mean that its ok to make false warranty claims just because you want a new phone. Its instances like this that cause the changes in policies for refurb phones, too many people filing false claims so they start to tack on extra fees with things.
If you really need a new phone that badly, buy one from craigslist or ebay and sell your bionic to offset the price.