DS has a 13hh pony, she is amazing but we were told she is a bit strong by the previous owners - she came to us in a Pelham. She definitely listens and is well aware of aids and signals. My concerns are:-
a. I think the bit she came in is slightly too long, so do I just go for the next size down initially and stick with the Pelham
b. Because DS is only 8 (and current bridle she came with) just has 1 set of reins so it's not really using Pelham in the full way it should be anyway!
c. Do I just try a Snaffle and see if DS stays on 
d. other bits I have looked at :-
Neue Schule Tranz Angled Pony Eggbutt
Cherry Roller (really not sure about this one)
Butterfly Pelham
Neue Schule Performance Pony Butterfly Pelham
I only ever needed to use a Snaffle on my own horses so I don't feel like I know a huge amount about other bits. I cannot find any bit person in our area at all, been trying for weeks. I have someone coming out to look at her saddle but to find a bit/bridle person is seeming impossible !
Any thoughts are appreciated before I spend a fortune on a million bit combos 