This is a simple solution if you have the money and have room in the engine compartment. Install a heavier powerplant or change out your flight pack to one with larger cells (sub C). The increased weight of the flight pack mounted to the firewall will effectively move the CG forward. The last thing you want is dead weight. I realize there are times when dead weight is all that can be added but look for ways around this. I have an ESM Hawker Hurricane that took 1.5lb of weight in the nose to balance. I swapped out the installed Saito 1.8FS and replaced it with a Saito 2.2FS and removed 17 oz of dead weight.