Joe,
I understand your frustation with the higher average bowlers, but I still feel that giving a bowler negative pins for handicap is penalizing that bowler for being good enough to have that average. If there are a "number" of bowlers in the league that carry averages higher than the handicap cutoff, then perhaps it's time to raise the cutoff average to something above the highest average. But, if there are only one or two averages that high, unless they are on the same team or every one else on the team is near the cutoff average, then it really shoudn't give the team a great advantage.