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.