The drawbar length standard is really only important for implements that have a fixed shaft down the tongue with a short telescoping shaft with u-joints on either end centered above the hitch pin. With this style of implement the 14 drawbar length ensures that both u-joints are angled equally during turns, thus cancelling out the speed fluctuations that each produces individually.
The problem with pull-type mowers like yours is that essentially all the angle is taken up by the single u-joint at the front. Because there's no equally-angled u-joint to cancel it out you'll end up with vibration and chatter. The best solution for when just a single u-joint gets angled is to use a CV joint.
The longer you make your drawbar the closer to being equal angle your two u-joints will become and in theory it will reduce vibration. However, I doubt you'll notice much improvement without making the drawbar freakishly long at which point other issues like driveline length and overlap will become a problem.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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