I was in a similar position as you after doing about 6 track days last season on the SV. It has good grunt out of corners, but ran out of steam up top compared to the I4s. My only recommendation (that probably has little benefit at best) is to remove the secondary throttle plates for better airflow at high revs. If you aren't chasing power then lightened engine internals are another consideration, however this won't be cheap.
My best track upgrades were re-springing the forks for my weight, GSXR1000 shock swap, rearset riser plates, grippier footpegs, more aggressive brake pads, and just staying on top of maintenance. Worked well enough to get me into A group, but rather than going wild with the SV I personally ended up buying a cheap K5 GSXR600 that was fully set up for the track. I'm sure I will take the SV back out to the track again, but I think it is an excellent street bike and that is what I will primarily use it as from now on.