I drive a RWD & front engine
Mostly understeer in corner entry or when I decelerate
Don’t think it’s the differntial, must be the suspension or stabilizers
The car also bumps a little too much
Thanks! 
You could try giving it some toe out (+) but not much 0.1 or 0.2 should be enough.
Also decrease the rear rebound a bit, just a few clicks at a time.
I know you said you don’t think it’s diff but lowering the deceleration can make a car much more willing to turn off the throttle, most of my cars are set somewhere between 12 and 20 depending on the car.
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Stiff rollbars will cause slow medium corner understeer in both rwd front engine and awd cars.
For rwd reduce both the front and rear to 10/15, if car still understeers, keep reducing the front rollbar until you have the right balance between under and oversteer.
You can also increase front rebound and decrease front bump.
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This entirely depends on what your car, or your telemetry, is telling you.
Springs, ARBs, damping etc. are ell there to keep your wheels on the ground. When your wheels are on the ground the car will go where the wheels direct them to go, which will be a combination of where they are pointing, combined with their roll rates as allowed by your differential.
So, if you have loads of grip, an inability to steer stems mostly from your diff being too loose.
Alternatively, telemetry tells you that you are losing grip at the front.
in which case check your tire temperatures at speed and make sure the inner edge is hotter than the outer edge, and, after extended hard cornering, the load bearing tire (outer left) should have a flat temperature gradient indicating it was maximally used. Adjust the camber to achieve this.
If any of your tires cool down during extended cornering, they are not being effectively used - probably because your springs or ARBs are too stiff for that wheel :- downtune and rebalance the car. Or one of the inside or outside will lose grip because the dif is locking too early, so loosen it.
Just watch your tire telemetry on corner entry:between the temp, grip and camber it will tell you which tire and why is failing .
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Decrease decel.
Could also be driver error, if you are going in to quickly your going to understeer. May be a case of just needing to slow down more.
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Telemetry in FH4 means almost nothing. Understeer can be fixed with tire pressure, rollbars, damping and diff.
Front engine RWD can suffer from low/medium speed understeer which is easily fixed with rollbars and diff. Try 60/40 diff and 15/15 rollbars.
Higher powered RWD, I would lower both the accel and feel for smoother corner exit.
Once you have a base tune, test and adjust.
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I am very happy about all the answers/tips!
It helped! 