Biting advice please
 

My 8 year old daughter has a gypsy cob on loan, he is a lovely boy but we?re having a few issues with bits, he doesn?t seem entirely with any of the bits I?ve tried so far ( hanging French link, Mullen loose ring, Wilkie copper lozenge) he often will try and get tongue over bit and snatch reins down, I appreciate we may need to try several bits but can anyone suggest ones to try?

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