Keep them at 100%, and all realism on. Have tried changing some of the percentages, but think 100% is ok. Leave "AI tank heavy" off in campaigns, as I build my core around an inf. bn.
Halstein
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"Til fraegthar skal konung hafa, en ekki til langlifis!" Magnus Berrfoett
I like to use different settings for "hitting", "spotting" and "rallying" to simulate the effects of climate and time of day. I dug up a table somewhere (and then made it into a word doc, then a pdf), which provided me with the parameters (visibility settings were the key). I leave infantry toughness, tank toughness alone and "xxx" is my standard "Troop Quality" setting.
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"Wir Deutschen sollten die Wahrheit auch dann ertragen lernen, wenn sie für uns günstig ist."