Hard to say but it might be the speed. Don't forget to punch the data you collect in the TDC (click on the arrow button on the right-hand slide-out panel). Try to do the training missions first, the American TDC is good but you have to use it the intended way. I try to experiment with the constant bearing firing method but I seem to be less precise than with the basic, more-or-less check bearing method.
Also, if you uste the speed and target course given by your crew when you click on the stopwatch icon, remember it depends on the precision of your stadimeter ranging so it will only be usable at rather short ranges. Unlike a real plot, this will only use last two bearings and ranges (real-life plot team would always use the oldest and the newest position to avearge-out the errors). I still have map contacts enabled and use this to work out target course and speed, then use this to check the precision of my ranging.
I also recommend the "Easy AoB" mod il you play FotRS, it really helps.
Hope this helps.
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