If there is to change anything, change it before the coin hits any major exchange. Otherwise it'll cause some bad rep.
look the fedoracoin,
https://bitcointalk.org/index.php?topic=391192.0i think this coin is very promising，for multpool,the dif is changed from more than two hundred change to less than fifty,except multpool mining in low dif,the nethastrate is about several hundred M，you can also see the reddcoin,they plan to be modified immediately,or will follow the fedoracoin and other.