When you try again, can you look at your RPMs when you’re at max speed and attempting to take off, and tell us what it is? I’m wondering if your throttle controller isn’t calibrated to actually achieve full throttle, or if mixture isn’t set properly when taking off, giving you much lower engine power than normal.
When you load into the simulator, are you starting directly on the runway with engines on, or do you start parked with everything off?