Other than die hard PPC shooters, I don't think anyone uses a pure Isosceles stance anymore. The modified Isosceles stance is what most of the good shooters use now.
No one on this forum is going to be able to coach you through your transition because grip, balance, stance, and so on are pretty much individual preferences. Find what works best and remember to experiment a little along the way.
[This message has been edited by Ron Ankeny (edited November 12, 2000).]