New Here: Calculating weightlifting calories burned...

I currently weigh ~185 lbs with 19% BF if the Tanita commercial scale can be believed (very heavy thighs/quads, so may distort readings), and I've seen different estimates for weightlifting calories burned:

• MapMyRun gives 9.43 calories/minute, although MMR tends to always be on the high side
• BodyBuilding.com using ACSM metrics gives 4.4 cals/min (light-moderate) to 8.8 (vigorous)
• LiveStrong gives the same range as BodyBuilding above, but if body-weight exercises are involved, the range is 6.67 c/m (moderate BW) to 11.83 (vigorous BW)

I analyzed the times of my last gym workout and noticed that I spent:

• 28% of the time performing exercises with BW weight
• 72% of the time walking between stations, putting on/taking off weights, stretching, plyometrics
• At no point did I sit down, although I paused for perhaps ~30 seconds between some sets

I then estimated that the 28% was equivalent to 11.83 calories per minute (vigorous BW), and that the 72% was equivalent to 6.6 calories per minute (moderate-vigorous, not BW), giving me an average cal/mi of 8.06.

Is this correct? Should it be higher or lower? Note that I excluded cardio intervals, which increased my HR throughout, and resting/sweating/heavy breathing periods right after hard sets...

Thoughts?