I'm still not sure about influence having a say in bodyguard size, and I'm quite sure that command doesn't.
There was a thread about that in the Ludus Magna some time ago if I recall correctly. You may want to look it up there.
More bodyguards would indeed be nice for a veteran general; sadly, their number doesn't grow too much because your countless victories provide you with the victor trait, which lowers PS. Some others also do (e.g. careless trait line).
Thus, keep the valuable general in the back until the decisive moment and use a second family member to carry out the "regular" charges. With some luck, he'll get the scarred trait line and is unlikely to ever die in battle.
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