Itemsadder and Oraxen bug

Hey there, i have a question the bug that the Leather Armor have no texture or are realy bugy. Is there a way to fix it? I have seen the conversation between optifine and Itemsadder and the problem was by optifine and they fix it but Optifine runs very slow and bugy this mod is not that what is was. But the Mod Iris are very nice and runs so good i dont wont to use Optifine hehe. I hope my english is understandble i am from germany ^^