The Prussian artillery did not fight well in 1806-1807 and many units were permanently disbanded because of poor performance. One of the reasons was the lack of an artillery school until 1791 and the other was Frederick the Great. Prussian artillery was both outshot and outfought by the French in 1807. Russian General Sievers had some very telling remarks about why the French artillery was superior to the Russians in 1807 and I would rate the Russian artillery arm superior to that of the Prussians from 1800 on. The Austrian artillery had been superior to the Prussian since the 1750s.
Mounting gunners on ammunition limbers was not innovative during the wars. The British did it as a matter of routine in the Peninsula and since von Holtzman had developed the Prussian limber with the ammunition chest on it in the 1740s I would submit that he was the innovator in this case, not the Prussians during the period 1792-1815.