Judder spring causes more issues than it solves , usually the first thing that gets removed is that with a normal friction plate ....... heavier springs may help , but if the basket is grooved , it is going to be jerky when disengaging and could cause stalling by it grabbing
Not sure about Florida (I am in Idaho , and others here are in Australia and California and Arizona) so your best bet would be to ask at the local bike shops to see who everyone uses , or get a aftermarket one from Tokyo Mods or GET or something ...... but it should not be a must do , just a improvement thing , it should run without stalling provided it is set up correctly , and yes counter clockwise should raise the idle .... , try that first , if it still stalls , then look at the clutch grabbing as a issue (how grooved is the basket ??)
If it is like this , it is worn and needs replaced (you can file it down smooth to get you by for a while , but it will need to be replaced soon if it looks like this)