It's been awhile, but thought I'd update with something funny I discovered.
I've never really trusted the harmonic balancer and where it said 0 deg was. I tested with a piston stop and knew it was off a few degrees, but it wasn't enough for me to worry about. This thing is megasquirt tuned, so I really can just give it whatever timing it wants and be good with that.
So I got lucky with someone selling an aftermarket balancer, used. It's the 90055 Pro Products PowerForce damper.
I set my old balancer at 0 deg, right on the mark before I pulled it. Here is where the new balancer is showing it should be:
The white mark at the top on the balancer is 0 deg. It's probably close to 15 deg off lol. This is before I torqued down the bolt, so I know I didn't move anything when installing.
And now that I think of it, I've always had an issue with sync loss events if I went above 28-29 deg at light cruise. I also tried sneaking up on 30 deg at idle just to see what it would do, and it would sync loss every few seconds. But other than that, the car ran great.
If anyone else has megasquirt and is having weird sync loss issues, make sure to check your balancer as it may have spun. I've attached pictures of my old balancer too. You can see the rubber is definitely cracked.