Comparing the B206 to an R22 is just not on. For the R22 to carry more it would need to be redesigned with a head and blades that had a lot more inertia which would require a stronger gearbox and what you would actually have is a different helicopter altogether.
Frank built a machine very close to it's limits and as has been seen time and again it is a tricky little thing to fly.
The blades and head on a B206 are massive when compared to the light weight and fairly insubstantial design of the R22 blades (which constantly have issues).
I think as has been pointed out several times with the current AUW you only have about 1.5 s to drop the pole I think with increased weight and making no design changes this would reduce even further with even more R22s hitting the ground than do currently.