To much graft will tire and take the keeness out of a young pup
Be patient , its just a matter of time.
I ran an inexperienced rusell with the lurchers and she began to develop there style of hunting so i cut it out while she was learning her job.
Someone once said if a dog marks a hole bolt the rabbit for the dog.
Sounds like a good way to create a dog thats keen to mark up.
Good luck