The Leshak has three big issues.
First: Paper DPS =/= applied DPS. Yes, you can hit 3k with full spin up. Will you hit that during any site that doesn't have a tower bash? Not likely. Get jammed, your DPS is reset. Target dies, your DPS is reset. It takes more than a minute to hit that top point, most things don't last that long.
Second: Cost and utility. To reach our fitting requirements demands a fit that costs 3-5 times a starting vindi and requires such concessions that you can't do anything with it. No webs, no paints, no fleet support of any kind whatsoever.
Third: Speed. Leshaks are extremely slow. That makes keeping up with the DPS blob harder and getting into optimal range for damage less likely.
We've done testing of the hull and it just isn't worth it. It doesn't do anything that even a beginner fit vindi can't do better in just about every way.