That's why I use the DTD weight pockets attached to the wing. Gone are the days where I let myself get into a weighted but not supported configuration.Be very careful when cutting on sidemount rigs... If you cut mine like an idiot, I'll sink straight to the bottom of the ocean, which is sad. The weights are in the harness, which is under the BC, which is a separate item (Stealth 2.0). So if you cut the BC, bye bye.
As for more difficult with sidemount, surely if you have 2 tanks instead of 1. But remember that sidemount can be done with a single tank as well....