Then you need to change the math for Ipk=Vref / (8*0.05). Then i think vref of 0.23v would be what sort of caps the motors current, but thats sort of crazy low, basically with these motors adjusting vref is mostly pointless. If you do change the motors with the other type then playing with vref should produce results much more noticeable. On the other hand, its good that you have correct Vref relation now so you can avoid setting Ipk higher than 1A and avoid the drivers getting too hot or burned out. With the 30 ohms motors, currently doesnt matter how high vref is because the motors just cant draw enough. But with the 1.65ohms motor you should really take care not to set the Vref too high.
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