I received a few more interesting comments from Leon:

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Your EGT at 1400 seems to be quite a bit on the low side.  1650 Deg F is
about right for max power,  and 1500 for "lean of peak" cruise.  Under full
load,  the EGT has a propensity to skyrocket over 1700 if you don't
carefully control the mixture and timing.  I'm wondering why in your case,
it doesn't??

I still don't have ANY idea about what timing you are running on the
engine.  As the boost comes up,  the timing MUST be retarded,  and
preferably,  the split between leading & trailing should increase as well.
13B's normally run L = O and T = -20 at idle.  Both advance about 12 -15
degrees up to about 3,000 RPM.  As the boost comes on,  the timing should
retard back to L = Zero and T = -20,  the exact amount depending on MAT and
air/fuel ratio.
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What EGT readings are others getting?

Does anyone know how the timing split is set up in the EC2? I think the
timing is retarded with boost, but I remember reading somewhere that both
plugs fire at the same time.

John Slade