Of course you have a point there, and it actually isn't incompatible at all with what I wanted to highlight: Do the optics as you see better, and then update the other angluar angle views of the open bridge, etc, to match. What I want to stress is the importance of keeping the proportions, and not being used to see the enemy ship at a certain distance when still surfaced, and then suddenly it appears much closer when submerged. This can easily screw your approach because you lose a sense of how far or close the enemy is, and you miscalculate the space needed to maneuver.
1.5x should allow keeping the tactical view, 6x all details and getting accurate masts measuring, etc. as you rightfully point out.
