I think there is some confusion about how much power the motor returns for a given rider effort.... While 100% peak power refers to the maximum motor power, ie 240W, it is not totally clear what support is. It could be a % of rider input, if so then at 35% the rider would have to input 240 / .35 = 685W for the motor to be at max...
The Support Level power settings are multiplication factors, and the SL 1.1 motor provides or adds up to double (2X) what the rider applies. Thus at a Support Level setting of 35% the motor will provide an additional 0.35 x 2 = 0.7X what the rider inputs. So for your example the rider would only have to input 343W to achieve maximal motor output.
Here's a simple test you can try to convince yourself:
1. Activate Mission Control on your phone and go to the LET'S RIDE icon.
2. Click on the STATS menu at the top and set two windows to report RIDER POWER and MOTOR POWER (just press and hold a window to see choices).
3. While riding compare the RIDER and MOTOR readings with your Tune Settings.
For example if you set Eco to 50% Support & 50% Peak Power you should observe that Motor Power is similar to Rider Power (i.e., 1X additional power). If you set the Support and Peak Levels to 100% you should see Motor Power twice the Rider Power (i.e., the bike motor "doubles your effort"). Intermediate Support and Peak Settings will give corresponding proportional values.
By the way, the max power output of my Levo SL shows up as ~300 watts, and I can get this with 150 watt input in Turbo mode