One thing you can do is put a back and sides on the hood. This will reduce your face area to the height of the hood above the table.
For example if you go with 24 inches it would be 60x24 = 1440/sqin divided by 144 = 10 sqft times 125 = 1250 cfm needed.
Cutting down to 22 inches high would be 60x22 = 1320/sqin divided by 144 = 9.167 sqft times 125 = 1146 cfm needed.
I have mine at 20 inches which seems to be a good height for seated work on beads and small sculpture. you can see my setup in this link:
http://www.lampworketc.com/forums/sh...ad.php?t=64554
At 20 inches the figures would run 60x20 = 1200/sqin divided by 144 = 8.34/sqft times 125 = 1042 cfm needed.
With sides and back, I have heard you can cut down the multiplier to 80 or 100 instead of 125, but my view was it is better to have more suction just in case.