The one you're calling the "throttle stop" is the "Full speed set bolt" according to the Isuzu injection pump manual.
Its used to adjust maximum governed RPM. I would leave it alone for now.
Edit: - Re EGTs - definitely try more boost. See if you can get 15-18psi and see how its behaving then. Mine definitely feels like its lacking top end as you describe, but it does pull well lower down. I'm not sure that they ever feel strong at the top. The others I've driven I haven't pushed to the governor to see (bit anti-social to drive borrowed vehicles like they are stolen, and you can't hire any for "testing"
)
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
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