I went ahead and added +0.00029103 to the end of my address, sharecount skyrocketed. Might recommend it to anyone mining p2pool.
Hi again, I'm trying that and works... and if you use "-s 5" when you run cgminer your rejected shared is fewer... but i don't know what meaning "-s 5" :S
PD.: I do this formule: MyHashRating * +0.00000116. Ex.: 370*0.00000116 = 0.0004292 --> -u YourUser+0.00042925