yeah, that's how it works. you don't gain any dmg bonus from aspd on one-shot skills.
the displayed sheet dps is for constantly casting@2aps. it doesn't work for cd skills.
take your weapon damage + source damage, add them together to make your base weapon damage. should be something like 1800-2300. then, you multiply that by (your int / 100) + 1...so if 9000 int, multiply by 91. Then, to see what your normal damage range should be, multiply that number by (1+ (fire% bonus/100)), then multiply that by (1+(meteor%/100)). to get your crit damage, multiply that range by (1+ (CHD%/100))
for me, my weapon damage range is 1744-2220 (weapon + offhand). I have 9104 int, 101% fire damage, and 15% meteor damage, and 404% CHD.
my damage will be 1744*(9104/100+1 = 92.04) - 2220 * 92.04 per swing. This comes out to 160,517.8-204,328.8. My fire attacks will do that range * (1+ 101/100 = 2.01) -> 322,640.8-410,700.9.
My molten impact, therefore, will do that range * (1+15/100= 1.15) * 16.48 = 6,114,688.4- 7,783,603.2. My crits will do that range * (1+404/100=5.04), which comes to 30,818,029.5-39,229,360.1
This is with a sheet dps of 902k and a fire dps of 1.8m.