iv noticed with certain armys including russia and poland , that wen u bring woodsmen and put at least 1 valour , 1 weapon , 1 armour , they become killin machines along wi the nice cavalry bonuses u can get wi the cheaper infantry.So u can realy take advantage of stronger armys and units ,
example teh scottish gallowglach and highland nobles who have better stats,
fail against them.

as i say tho the better cavalry with the cheaper inf is worth its weight in gold
pity i ***** h8 poland lol.

give it a try
enjoy :D