Jason, since you are using the same car as me, you can try my setup if you want
I find that for me and the M18 the classic setup from real life for openwheelers of "harder front, softer rear" works quite well. If not lightning fast, it is very driveable and with good traction on corner exit, and when you want to do a full race I think that counts most.
VehicleClassSetting="HSO-F5000-72"
UpgradeSetting=(0,0)
//VEH=GAMEDATA\VEHICLES\HSO-F5000\M18\1972\50\1972_50.VEH
//UpgradeClass=
//Power Steering=0
//Note: settings commented out if using the default
[GENERAL]
Notes=""
Symmetric=1
//CGRightSetting=0//50.0:50.0
//CGRearSetting=0//40.5:59.5
//WedgeSetting=0//0.00 turns
//FrontTireCompoundSetting=0//GOODYEAR
//RearTireCompoundSetting=0//GOODYEAR
FuelSetting=19//20L (8laps)
//NumPitstopsSetting=1//1
//Pitstop1Setting=0//1L (0laps)
//Pitstop2Setting=0//N/A
//Pitstop3Setting=0//N/A
[LEFTFENDER]
//FenderFlareSetting=0//0.0 cm
[RIGHTFENDER]
//FenderFlareSetting=0//0.0 cm
[FRONTWING]
FWSetting=4//5
[REARWING]
RWSetting=5//6
[BODYAERO]
//RadiatorSetting=1//2
//BrakeDuctSetting=2//3
[SUSPENSION]
FrontAntiSwaySetting=2//30 N/mm
//RearAntiSwaySetting=2//30 N/mm
FrontToeInSetting=19//-0.05 deg
RearToeInSetting=24//0.20 deg
//LeftCasterSetting=45//2.5 deg
//RightCasterSetting=45//2.5 deg
//LeftTrackBarSetting=0//0.0 cm
//RightTrackBarSetting=0//0.0 cm
//Front3rdPackerSetting=0//0.0 cm
//Front3rdSpringSetting=0//Detached
//Front3rdSlowBumpSetting=0//1
//Front3rdFastBumpSetting=0//1
//Front3rdSlowReboundSetting=0//1
//Front3rdFastReboundSetting=0//1
//Rear3rdPackerSetting=0//0.0 cm
//Rear3rdSpringSetting=0//Detached
//Rear3rdSlowBumpSetting=0//1
//Rear3rdFastBumpSetting=0//1
//Rear3rdSlowReboundSetting=0//1
//Rear3rdFastReboundSetting=0//1
[CONTROLS]
SteerLockSetting=12//17.0 deg
//RearBrakeSetting=40//55.0:45.0
//BrakePressureSetting=5//90%
//HandbrakePressSetting=0//0%
[ENGINE]
//RevLimitSetting=0//8,600
//EngineBoostSetting=0//1
//EngineBrakingMapSetting=0//0
[DRIVELINE]
//FinalDriveSetting=3//10/30 (bevel 1/ 1)
//ReverseSetting=3//20/67 (10.050)
Gear1Setting=12//14/34 (7.286)
Gear2Setting=21//10/18 (5.400)
Gear3Setting=31//40/59 (4.425)
Gear4Setting=38//10/13 (3.900)
Gear5Setting=44//16/18 (3.375)
//DiffPumpSetting=0//0%
DiffPowerSetting=1//5%
DiffCoastSetting=8//40%
//DiffPreloadSetting=0//1
//RearSplitSetting=0// 0.0:100.0
[FRONTLEFT]
CamberSetting=15//-2.0 deg
//PressureSetting=20//110 kPa
PackerSetting=2//0.2 cm
//SpringSetting=4//60 N/mm
//SpringRubberSetting=0//Detached
RideHeightSetting=0//4.0 cm
SlowBumpSetting=3//4
FastBumpSetting=3//4
SlowReboundSetting=3//4
FastReboundSetting=3//4
//BrakeDiscSetting=0//2.8 cm
//BrakePadSetting=0//1
[FRONTRIGHT]
//CamberSetting=5//-3.0 deg
//PressureSetting=20//110 kPa
PackerSetting=2//0.2 cm
//SpringSetting=4//60 N/mm
//SpringRubberSetting=0//Detached
RideHeightSetting=0//4.0 cm
SlowBumpSetting=3//4
FastBumpSetting=3//4
SlowReboundSetting=3//4
FastReboundSetting=3//4
//BrakeDiscSetting=0//2.8 cm
//BrakePadSetting=0//1
[REARLEFT]
CamberSetting=15//-1.5 deg
PressureSetting=28//118 kPa
//PackerSetting=5//0.5 cm
SpringSetting=2//40 N/mm
//SpringRubberSetting=0//Detached
RideHeightSetting=0//4.0 cm
SlowBumpSetting=2//3
FastBumpSetting=2//3
SlowReboundSetting=5//6
FastReboundSetting=5//6
//BrakeDiscSetting=0//2.8 cm
//BrakePadSetting=0//1
[REARRIGHT]
//CamberSetting=5//-2.5 deg
PressureSetting=28//118 kPa
//PackerSetting=5//0.5 cm
SpringSetting=2//40 N/mm
//SpringRubberSetting=0//Detached
RideHeightSetting=0//4.0 cm
SlowBumpSetting=2//3
FastBumpSetting=2//3
SlowReboundSetting=5//6
FastReboundSetting=5//6
//BrakeDiscSetting=0//2.8 cm
//BrakePadSetting=0//1
[BASIC]
Downforce=0.500000
Balance=0.500000
Ride=0.500000
Gearing=0.500000
Custom=1