When you get it right it's noticeable that, not only are you more progressive, but you are almost in a straight line when you apply the throttle. Unless you want to practice drifting (and who doesn't - it's fun ) you need to follow the rule Jackie Stewart told Capt. Slow - never put your foot down on the throttle until you know you don't have to take it off again.
On the subject of tyre pressures, you may find that more in the rear would mean the tyres can clear the water better. However, I agree that the fronts should be higher to counteract the oversteer. Adding a rear anti-rollbar will only worsen the oversteer unless you stiffen the front one at the same time, which makes it a bit pointless.
Regards,
Giles