Look in the spin box settings to find the lowest setting for low throttle--it will probably be 1.00 msec.
Then,use the spin box connected to the Rx throttle channel. to set the low throttle travel adjust (orATV or whatever your Tx calls it) to read 1.00 msec---on my JR Tx it's around 130%.(You're OK with 100% high throttle on the Tx,and that will be around your 1.92 msec.)
Now switch on the Tx, and Rx, and connect up the motor battery with the throttle stick at its lowest point, and no trim.
The ESC will not arm yet(no beep).
Go to travel adjust on the throttle channel, and increase the downward travel, one unit at a time, until the beep.
This will be your low (est) throttle position--and the point at which any brake setting you have dialled in, will commence.
Leave the ESC curve as linear, and use the throttle curve function on the TX to adjust the motor's throttle response.
Most people find that the curve needs to be steeply upward at first (so that 50% at the Tx is around 70% output), and then sloping more gradually to 100% at the top.
The spin 99 usually has a small dead band at the very bottom of its travel,which may or may not bother you----one of my pattern friends prefers the OS ESC for that reason.