If you’re good with buying the gas....... go for it.

Yeah I really don't mind. I'm already buying and mixing race fuel anyway. The VP race fuel concentrate that autozone sells in the quart cans works pretty well for longer trips as well. I really think the compression boost will bring the combo together. If the vert needs loosen then i'll get that next year. Like Lenny said, if you loosen the vert now, you might find it too loose after the engine tweaking. I'm confident the spring check and compression boost is the key.

Weighed one? Over or under 150 grams?

I have no idea what they weight, but they do have Titanium retainers. I wont be pulling this apart for a couple weeks yet.

Dual spring with flat damper between the inner and outer coils? If so, more likely to chew up the ti retainers.

I don't recall that. Twin spring with TI retainer. No damper as I recall.

My favorite solid flat-tappet spring for .600"+/- lift was the Lunati 73121 (no idea who the manufacturer is, or if the same spring is offered by other companies). Some were made as dual springs w/dampers, others were dual springs w/o dampers (interference fit), but the part # was always the same. I had some of both style, but preferred the no-damper style since they didn't chew up the ti retainers I liked to use.

1.540 Outer spring OD
1.140 Outer spring ID
.860 Inner spring ID (no damper version)
.794 Inner spring ID (w/ damper version)

Advertised pressures:
Closed - 142# at 1.940
Open - 402# at 1.250
Rate - 377 #/in
Coil bind - 1.089

The other thing I liked about them was they're light: 126 g (no-damper version) vs 153 g for COMP 928/930 dual w/ damper. Even the w/damper version was still about 20 grams lighter than the 928/930.

I don't have any more new sets because I sold off my spares when I switched to a solid roller. If you ordered them new today, I suspect they'd be the w/damper version, based upon the current product description.