... sportiest ... hot rod ...
First step: If your rear wheel has 3 spokes, you have a "79T" F3 which is lighter but not much sportier than an RT. If your rear wheel has 6 spokes, you have an "89T" F3 which provides better acceleration and perhaps about 10hp more along with a "Sport" mode switch. This is a fundamental starting point.
Second step: Tires -- Brakes -- Suspension
A variety of performance tires have come and gone (eg Toyo) so you need to search this forum and ask performance-oriented members (eg hypurone) what tires they recommend.
Your brake pads and rotors will be EBC. Most members prefer the HH compound. BajaRon is your go-to guy for selection and purchase.
I believe there are only two suspension upgrades. A BajaRon swaybar and shock absorbers. WRT to shock absorbers I suggest searching this forum and then discussing the options with BajaRon before making a purchase.
Third step: Powertrain
Stage 1 or Stage 2 firmware upgrade from Monster/Wick-It combined with catalytic convertor removal and muffler replacement. WRT exhaust, RLS offers great workmanship with great prices.
Fourth step: Driver
Back in my open tracking days, I was repeatedly advised my best two investments were instructor time and track time. And that was correct. I always asked for an available instructor and I was always the last off the track.
Finding a 3-wheel instructor will be a bit more difficult. I would start with your Spyder dealer and then ask ATV/UTV dealers. And then there's the problem of suitable facility/course. Plenty of tracks for cars and motorcycles; don't know any for 3-wheelers.
You will hear people telling you how fast they went on such and such a road thinking nobody else could do better. A road is not a track. Not only is a track safer but it's also the great equalizer. You can't lie on a track. And if you misbehave you will see a Black flag and be spending some facetime with the course marshal.
But it's worth the time, effort and money for training. You will be a better driver and enjoy your Spyder more.
Best wishes. Post pictures.