David, your old pulley ratio is 1.53:1, you new one is 1.35:1. The new ratio with your larger pulley is 13% SLOWER than before. You might want to keep an eye on your head temps.
Stock fan ratio is 1.59:1, the stock fan is the fastest and flows the most air. Your new ratio is almost 18% slower than stock. I'd pay attention to oil temps. And buy a CHT gauge.
Or, the best solution? Buy a stock size(6.75") degree pulley and another even longer belt. Take the crank pulley off first to see if it's the stock threaded type or sand seal.
I'll look at the crank pulley situation tomorrow. What are the implications of stock threaded type or sand seal ?