Am I able to increase the current without also increasing the voltage?
26 motors x 0.68A(start) = 17A  if using 3V, allowing 10% drop from 3.3V means the driver RdsOn is 0.3V/17A &lt;= 176 mΩ. 

It also means your power supply can deliver 17A @ 3.3V or has a Supercap with 100ms start time, with dV/dt=0.3V/0.1s=3=Ic/C so for 17A C=17A/3 =~ 6 Farads with ESR ~ &lt;  &lt;&lt;100 mΩ  such as this but now you need to regulate the charge current.

Back to the drawing board on what you really need to do.

Arduino drivers are 25~50 Ohms.