You could also move the receiver battery pack into the nose of the airplane- possibly beside or under the fuel tank- then you will have to use less 'dead weight'.

As far as attaching weight, there are several methods. I use the stick-on weights myself. I have seen lead shot (from a shotgun shell) epoxied into the nose of a plane, and some people melt down recycled lead weights (from a tire store) and bolt that on too.

Depending on how large the firewall of the plane is will also determine where the weight is placed.