Digifit Question

for me digifit (app version called spinning + zephyr HxM) seems about right, or at least in linewith calories calculations obtained by inputting average bpm into the calculators on http://www.shapesense.com/fitness-exercise/calculators/heart-rate-based-calorie-burn-calculator.aspx and http://www.shapesense.com/fitness-exercise/calculators/net-versus-gross-calorie-burn-conversion-calculator.aspx

I know this is an old post but the issues is new to me.
I love the Digifit App, it has great visibility seems to work well with partner apps but the DANG calories seem way out of line. I wear a BodyMedia and use a polar Bluetooth chest strap as well as a polar watch, all of those read within a few calories of each other in an exercise session but Digifit reads 40% higher or more. Yes I was wearing three chest straps at the same time. I have done several rounds of cardio testing in digifit to build my own personal zones and thought this might be the reason that is was different. I did the "fitness" test with polar beat and it came pretty close to the same VO2 max as Digifit found. I made the apps the same for VO2 and still got wild extreme differences in the calorie counts. Even the gym machines are close to the polar readings but way under the Digifit ones.

Like I say I love this app but I cannot afford to use the bloated calorie count so others be aware of the issue. I sent them some feedback and they thought their calculations were accurate and the difference was in the ability of the Digifit app to "refine" the zones and calorie burn with cardio testing. I think if that were true than the BodyMedia would vary as well but is is real close to the Polar readings.