When you swap your gearing from 7:1 to 11:1, the new torque will be 57% more than the old torque. To calculate this, you can divide the new gear ratio by the old gear ratio and subtract 1. In this case, (11/7 - 1) * 100% = 57% increase in torque .
If you want to calculate the new torque as a percentage of the old torque, you can divide the old gear ratio by the new gear ratio and multiply by 100. In this case, (7/11) * 100% = 63.6% of the old torque .
So, your guess is almost correct. The old system has 63.6% of the new system’s torque, which means that the new system has 57% more torque than the old system.
It is possible the total weight of the system can reduce torque but increase momentum. The teeth count of gears, and other factors can reduce or improve torque in my belief.