I have the Logitech G920, but replaced it with the Fanatec Clubsport wheel v2.5, pedals v3.0, gear shifter SQ, & handbrake with the Xbox hub because of the issues I was having with the G920.
However, now on the Fanatec racing rig I am now using. No throttle for 3 seconds. Does not matter how much I adjust the acceleration dead zones, nothing changed. Still shows that I have 5 indicators showing in acceleration at a complete stop or 0 MPH. In first gear, takes about 3 seconds to accelerate. Sputters for a few times, then starts to work, which takes about 3 seconds. Once you get going, no issues, except if you drop in speed to the lowest gear or the car is still rolling in reverse or back to 1st gear. No throttle until you come to a stop. Redlining the throttle, helps to get going in first gear, but this is not a solution for a constantly dying accelerator, that makes drifting, burnouts, and so forth impossible.
I tested the game controller. Too my surprise, the first 5 indicators on the accelerator bar are lit at zero MPH. The 3 second delay is still there on 1st gear. lol However, now there are no brakes, instead I have two clutches. One the obvious one (LB), two the brake is now a clutch (LT button), checked, states it is a brake in configuration. E-brake still works, but the brake used to work before on the controller for FH2 when I had the G920 connected. Somehow, now it is messed up on all of the Forza Horizon games I checked, which was FH2, FH3, FH4, FH5, FH6, & FH7. They are all now showing that I have 5 indicators into acceleration at a complete stop using the Fanatec wheel. No brake with 5 indicators lit within the acceleration bar using just the game controller connected by itself. Tried rebooting the console, same results. Tried different ports and disconnecting the other controller and testing, same results.
I have updated the Fanatec Wheel and its gear firmware. Recalibrated the center, shifter, pedals. Tested them on the PC, all worked as to be expected, but when I went back to the console. Same results as before.
On a different matter, in cockpit of car, the mirrors are way off or missing for a lot of cars I tried, with no way to correct it on the console. The same for the wheel (divitars) hands not matching what I am doing. The gearing is absolutely stupid at times. Most gear shifters are 5 to 7 gears. However, see some vehicles are using 10 - 12 gears, might work with a controller, but does not help anyone who is using a system that is limited to 5, 6, or 7 gears without a way to possibly achieve the remaining gears needed to compete in an event.
I have not had any of the game crashes, but I have witnessed other strange events, like no power at all, no turning, sudden out of control issues, but that could be caused by those hitting you from behind or a delayed response from a hit. Seemed the higher the level of Divitars used, the crazier their driving was, that is not what I expected from supposedly better drivers. Maxed out speed while swaying back and forth across the road with the vehicle on the verge, if not already, out of control crashing into everyone in the path to get ahead. Pushing you off the track, bumping you out to miss a checkpoint and so on is not what I call an advanced driver, but rather an inexperienced driver learning how to control their car. Sure, it make them tougher to beat that way, but I would have thought the Divitars would of been better at using skills and driving and not the opposite of that.
I appreciate any assistance I can get to correctly be able to compete in the races for any of the Forza titles I already own. Thank you for your time and cooperation! 
UPDATE: Turns out the game controller was not working on the LT button - lol. No response when test it using the controller testing software, but still moved in range. Swapped controllers, have brakes once again, but still the 5 indicators lit at a stand still for acceleration. Changing the deadzone for the low and high, made no change to those lit indicators.