i havethe same problem and found a great bit at the following, pretyt pricey but the curve creats loads of tongue which is usually why they stick the tongue out
http://www.shop4bits.com/item--Sprenger-Dynamic-RS-Stainless-Steel-Rings-Aurigan-mouth--4041488.html
i live near them and they have recently opened a shop and its brill! they do some really good bitting clinics rounds, just give them a ring really friendly