Hi Nico, the reason the outsides only do 3 weights workouts is because they do a lot more speed training and I see this as more important, you could do the 5 days per week weights but I think it would impact on your ability to recover and do the speed work at maximum intensity to ensure gains. I do not think there is a perfect weight for any player in any position and feel that the weight you are talking about sounds just right although some centres are over 100kg, so perfect is what is right for you and that is just a trial and error situation I had a player once who like to be closer to 90kg during Super 14 since it was a lot faster game and more expansive but wanted to be closer to 95kg for test match rugby, hope that helps, ash