Our Beta 60 is on Beta's standard mounts (they say the most flexible ones)

Shaft is supported at the outboard end by a cutlass bearing and inboard by the engine.

The shaft is 3 ft 9" long, with a PSS seal which of course gives no support

Coupling is a 5" diameter Drivesaver 404V ( https://www.gcsmarine.com/content/drivesavers/drivesavers )

I aligned within the generally recommended 0.001"/inch diameter, but wonder how useful and important this is with a flexibly mounted engine that will be in a slightly different location when under load.

How close should the alignment at the coupling be?

Any advice on how best to align this engine?