What Frits said.
The closer squish will increase the com as well as increase the squish turbulence - that has the same effect as advancing the ignition by lifting the flame speed.
You can pull out some advance if running a digital ignition , or simply retard the stator some.
And yes , check that the squish band is not the many times stupid reverse taper , whereby the end gases are trapped at the outer edge , near the bore.
With the exact result you have shown , piston edge deto.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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