^^What he said.
"However, it seemed that I didn't brake hard enough, bringing the contention for the first place to an end with the car smacking into the wall. Even when it's fully pressed down, the brakes aren't at 100 percent. You have to actually slam your feet into the pedal to stop the car....Unfortunately, the game or the wheel didn't provide a set of detailed instructions for what each setting actually does in terms of performance, so I only changed a few obvious settings."
That is not a problem with the brake pedal itself. That is an issue of the software setup in the profiler and in my opinion more of the in-game settings of the brake axis and sensitivity. There are very complex settings in Project Cars with brake settings down to individual cars. Driveclub has very little in the way of in-game pedal axis settings. You did not look into all that is required to make full setup use of the brake axis in PCars. Was this a time-sensitive review?
I have a G27 and a Thrustmaster T300 (using my G27 pedals with an adapter) and thousands of hours in racing sims and simcade hybrid racers like the Grid and Dirt series between my PC and PS3/PS4. I have used the G29 wheel in a Fry's demo kiosk using Driveclub on a PS4 and it feels inferior to my T300 on Driveclub, just like my G27 feels inferior on PCars on my PC (I have two copies of the game, one for the PS4, one for the PC, and I use the T300 for both...the G27 is put away). The direct gear driven wheel design is inferior to a belt driven wheel in every way, from centering feel down to feeling bumps and when the car's front wheels are breaking loose in understeer. Also, the direct gear drive is more jerky with the Logitech design.
The only thing I can possibly see that makes the G29 better than the T300 is the pedals. The T300 comes with cheap pedals that are worthless. You need to spend money to buy the better 3-pedal setup from Thrustmaster. If you have a G27 like I have, then just buy an adapter and use those pedals and get the superior wheel, the T300. The G29 is just a G27 with a new face plate and rim and only slightly improved G27 pedals for better tactile feel.