Need help from the suspension gurus here!

As suggested, calling someone who does this for a living is always a good idea. Front springs can be confusing, because on the face of it people think that a heavier spring has more energy. They don’t, they take more energy to compress. Which means they release that energy over a shorter distance. The car in the past, I have to assume launched well, didn’t spin and topped the suspension out in a reasonable fashion. Now it doesn’t transfer weight. The power in the car is the same? The nose is actually lighter. The difference is you have more spring rate/stiffer springs in the front. Your car, like my car needs a bit of help from the springs. Look at the springs like this, making up numbers. Say the car needs 500 lbs of spring force to hold the car up. With your spring it would compress 2”. 250lbs/inch x 2= 500 lbs. After the nose rises 2”, the spring is not pushing up anymore. Now the torsion bar, to get to 500 lbs you need to “compress” the bar 5”. 100lbs/inch x5 =500 lbs. the torsion bar is pushing up until the nose rises 5”. You should still talk to professional, because there has also been a lot of changes to the geometry of the front suspension and changed from torsion bar to coil etc…..