That's an amazing amount of smoke but it's unfortunate that it comes with a high power expenditure.

It's almost too much smoke (unrealistic) even for the T-34's diesel engine unless it is near the end of its service life and smokes excessively because of cylinder wear. Perhaps you can tone it done to produce less smoke and regain the motive power you've lost as a result?
A 15 minute run time stinks... [:'(]

-Harq