I hate to say it, but both of those problems are a case of "They all do that". Look closely at the reservoir after is finishes pissing. Is there any fluid left? It is hard to see. Mine will also piss out all but a little bit. Seems to be a very poorly designed reservoir but Triumph must have bought a 10 year supply. I may be wrong, but I don't believe there is anyway a blown head gasket could contribute to your rusty plugs. Since you said this is your only transportation then you must be riding in the rain. Plenty of opportunity to get water down around the plugs. There have been rumors about an improved spark plug boot but nothing has surfaced. People are trying all kind of ways to seal the plugs, vent the plugs, corrosion inhibitors, etc.