"Attacking vastly different size opponents will result in higher attack times and lower gains."

It is affecting about nw only or nw + land? How does the combination work? Any formula? How large is too large and how small is too small? Rumors saying no larger than 115% and no smaller than 80%. Lets say i am 200k network sitting at 1500 acres: for maximum gain i can only hit within
160k-230k? If I get 200 acres for hitting 230k (+15% my size) opponent, will I get lesser for hitting someone 240k (+20% my size)?