You can have more than 2 wingers. Example the 3-2W-2N-2W-1 (Butterfly) formation. The possesion difference is only accounting for the spectators & because I was playing force counter-attack tactics. Still doesn't reach that 20% penalty.
You can have 2 per side. You can't have 3 on the right, or 3 on the left.
e.g. the following formation is illegal because it has 3 wingers on each side:
xxx st. xxx st. xxx
aml xx xxx xx amr
ml xxx mc. xx mr
xx xxx xxx xxx xx
dl. xxx dc. xxx dr
~^~*~^~ My opinions are best when taken with a grain of salt. No iodine added. ~^~*~^~