plate type lsd, the more aggressive they are, the more you will understeer,
Yes.
I used to autocross a Lotus Europa that someone had cursed with a plate-type LSD. With good surface and fresh sticky tires, you would hardly notice it. With lesser tires or an autocross surface that was wet or just plain substandard, the car pushed like crazy. Once it started to push, there was nothing solving it: power-on, power-off, put in the clutch and coast, nothing.
Picked up a bottle of Slick-50 ManTran. Label said "do not use with limited-slip differentials". I poured in the whole bottle. Lowered the breakaway torque from 90 foot-pounds to 20. I put in a new bottle every spring. This helped a lot, and was less-trouble than splitting the gearbox to amputate the LSD.
After that, I had a Miata with the factory TorSen. Worked very well in autocross.
Then I bought a Caterham Seven. Installed 4.11/1 gears and a Quaif torsen-type LSD.
Sold the Caterham to buy a 2005 Lotus Elise. Open diff. (Lotus said the car was no faster around their test track with a TorSen than with an open diff. True, but in the USA we autocrossers wanted the TorSen. They finally became more-common in 2006 models.) I put in a huge front bar, no rear bar, lowered, 500 pound/inch springs on the front, 800 on the back, trick balljoints to flatten roll axis. I didn't usually get a lot of wheelspin, but the SCCA National-Champion drivers who who drove my car could. I'm not going to win any national championships, I'm just addicted to autocross since 1968.
After over a decade with the Elise, I replaced it with a 2011 Cayman 2.9 PDK Sport+. This has an open diff with wheelspin controlled by the rear brakes. Seems to work well-enough in autocross and I can afford to keep it in rear brake pads.
I have just picked up a quicker Caterham: 1700 Super Sprint. DeDion rear end with disc brakes. Wheels up in neutral, they both spin the same way. One wheel down, I can’t turn the lifted wheel. I was able to steer it while pushing it into my shop, so it is not a spool, but apparently a plate-type LSD. I have not had it on an autocross course yet. There is more weight on the front wheels than there is on a mid-engine car. If that, and the adjustable rear sway bar, is not enough to kill the evil effects of the LSD, maybe I can still buy ManTran. This is now my only manual-trans car and will be an interesting challenge to master: It is right-hand-drive, first one for me.
Two autocross cars. If the weather is perfect, the Seven. If it is raining cats and dogs, the Cayman is weatherproof and has Please Save Me.