i know standard practice is 23 gauge 1" inch needle for delt and thigh sticks....could you use a 25 or 27 even 29 1/2 " needle for delt and thigh sticks if you are relatively lean....had someone tell me he uses an 29 1/2" insulin syringe for delt and thigh sticks and has know problems even though it is a slow process ....could you use a 1/2 " needle?