The Dawes valve is to limit boost the whatever maximum you set. It has zero effect until it hits that maximum. The needle valve replaces the computer control for VNT (turbo) and helps with spool up rates.
My EGT was pretty much the same with either setting, just less "puff" when needed.
I did once hit 500 c, but that was with high boost, pulling a heavy camper and a long, steep climb. My Auber setup has a warning light at 500 c so I know this is the only occasion.
I removed the low boost part because it gave virtually zero benefit and slowed things down,
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