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My setup is.
120V Isolation transformer > 120V Variac > Auto-transformer

Transformers can be problematic with ramped coils.  Low frequency load causes transformer core to saturate.  Especially when interrupt frequency is a multiple of whole line cycles.  Current draw from transformer has large DC component.  Also, string of transformers adds a lot of series inductance and resistance.  Limits coil peak current draw and may change shape of line voltage ramp significantly.  Would need to scope to see how much change.

Nice to see success in spite of transformer issue.

I will test with just auto-transformer tonight because that is the only way for me to get 250v. I guess next best thing after that is QCW.

Hi Dave,

I finally received my PCBs. I made a small video to test the ESP-NOW protocol. I also wanted to push my full-bridge IXTQ52N30P MOSFETS to their limit of 300V@52. I thought I might be able to destroy them.  I tuned the circuit as much as possible with ZVS. I maximum voltage I was able to get was 250VAC (Destroyed my voltmeter on auto-transformer). On-Time is 8.3ms with 10Hz interrupt. I was able to get arcs over 13-14 inches long. Although I probably should have enclosed the ESP-32 in 3d-printed case with aluminium tape on top. My setup is very jank but I couldn't wait to give update. I have to make another feedback CT and phase-lead inductor.

My setup is.
120V Isolation transformer > 120V Variac > Auto-transformer

www.youtube.com/shorts/09zter6_IRM?feature=share

Next step is test DRSSTC feature of PCB
After that, add OCD protection as you suggested above and create updated version of PCB.

The individual frequencies do have effective coherence lengths greater than 60 cm. That's why single longitudinal mode lasers have long coherence lengths. It's the interference between the different frequencies that lowers the total coherence length.

Yes, that's what I thought. But we do disagree on your first experiment: I believe it to be much better than you seem to think it was 
The resolution is quite a bit above e.g. the monochromator Alan linked to. The interpretation can be misleading. Nice work!

I found a small section where a magnet will attract it

That's very unusual.  I haven't heard of any PVC with intentional ferrous additives.  My best guess is pipe was made in a sloppy factory and some steel shavings or other such contamination fell into PVC melt during extrusion.
Can you see down inside of pipe well enough to see if there's something stuck to inside wall?  For example, if pipe was cut adjacent some steel machining activity, perhaps some hot shaving fell inside and melted slightly to inside wall.
BTW, have you checked your design with JavaTC?  2" diameter is rather small for a TC.

ok so i make my secondary coil using 0.4mm wire approx 900 turns on 2" PVC but I found a small section where a magnet will attract it I may have chosen the wrong type of PVC and just wasted 12 hours of my life winding on a useless pipe for a tesla coil