I just got my new hardware delivered, a Saitek pro flight yoke&throttle quadrant and the VRInsight TT panel and I was advised to use FSUIPC4 to set up the controls, but I'm running into some problems.

-Regularly FSX starts reloading mid-flight. (Black screen, with the loading bar in the middle, like you would just be entering the sim environment.)

-I had several functions within FSUIPC programmed, which didnt do anything within FSX. It seems like there's no function assigned to them.

-for several functions where I need an on and an off function, I can only find a toggle, which is really annoying, since the switches 'turn' when another input source(mouse) is used, or when an aircraft starts up with a switch set to a different possition.

-when using auto pilot through FSUIPC, I regularly notice that a landing on autopilot doesnt find the runway and dives into the ground, well before reaching the runway. When I perform the same procedures by using the mouse in the virtual cockpit, everything works fine.

-With the pro flight yoke system, several times already, I've seen the yoke in my virtual cockpit slam to left or right and get stuck there, without any of the controls being touched(with the aircraft still parked on the ground, or when flying on AP). I have to move the hardware yoke in all direction for some time, before the virtual yoke releases again. The same I've seen happening with the throttle leaver, it slams to full throttle and doesnt want to go back down, untill I moved the hardware throttle back and forth, several times.

-Even with auto rudder active(I dont have pedels yet), my aircraft keeps drifting off to the right when taxying, the only way to counter this is by counter steering with the yoke. The rudders are clearly centered, but still I keep drifting off.

-About the VRInsight TT panel, I'm having trouble programming the switches on the middle and right part of the panel.
For example, I tried to program the cowlflaps to a T-switch. I programmed 'cowl inc' to the 'button pressed' function (when the switch is flicked on/up) and the 'cowl dec' to the 'button released' function (when the switch is flicked off/down). This made the cowl open and close for just a bit, so I activated the 'control to repeat while held' function, which solved the problem only for opening the cowl, but didnt have any effect on the 'button released' function. So now the cowl opens fully when the switch is flicked on, but when the switch is flicked off, it closes only to '69% open'.
(I can, however, flick the switch up halfway and back down several times and then the cowl closes bit by bit, but that, of course, isnt the intended use of those switches.)

-When I'm setting up buttons/switches for the TT panel, I notice that the first time I push the button to set the control number, I get a different number then the second time I push the same button.

-When I set the AP alt hold with a switch, it sets a different vallue then the alt I'm at, for example, when I set alt at 3000ft, it keeps descending to 2500, constantly, until I set alt by hand, with the mouse.

Can someone help me out here, please?