Zett is right, 0.2 density transforms itself into a massive bonus in close combat. In my own files, I decreased attack of spearmen by 4 points and gave them 0.18 lethality to compensate (spear is a big and powerful weapon after all) . When I tried to implement 0.2 density for some units, they lethality had to be decreased to 0.1 in order to retain balance between units.
In the end I resigned from fiddling with radius attribute. While it allows hoplite units to fight in truely close order, it also makes their formation impossible to break. I mean, look at the macedonian phalanxes. They are impervious, when keeping an orderly pike-wall, but it`s still possible to mess them up. If they formation gets messed up, they easily fell prey to other units. Hoplites with 0.2 radius have no such weakness however. They will keep their extremely close formation no matter, how badly they are disordered and from whatever side you attack them.
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