Should I not rather recite Quraan instead of the 13 tasbeehs prescribed by my sheikh?

Answer

If you want to prepare your own spiritual prescriptions, then why have you adopted a shaikh to guide you? First, respectfully inform your shaikh that you are terminating your relationship with him. Then resort to your own prescriptions. If the shaikh is a genuine Shaikh of Tasawwuf, then it is incumbent to submit to his prescriptions.