I missed the bit about the nose weight Geo. I normally use either strips of roofing lead, or lead shot or air rifle pellets, held in place with 'Plasticine', which itself adds a bit of weight. I use the formula 'Weight x 'P', where 'P' = Plenty' !
I add the weight - as much as possible, wherever possible (rather have a heavy model than a tail sitter), then balance the model with a finger tip under each wing tip. If it doesn't drop 'nose down', I add more weight!