Not hitting target boost in first (or even second) gear is quite common, and often there is nothing to do about it. What happens is the engine revs through first gear quicker than the turbo can spool up, and by the time it spools the engine's flow is past the turbo's peak flow capacity, thus limiting boost. Also first gear doesn't generate as much exhaust heat which limits spool and boost.
This is why I... err, I mean some tuners do road-tuning log runs in fourth gear where they know boost is fully formed and stable.
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