I don't see it as an issue either.
I also wonder if the photos showing the bow high might be that those boats where not loaded with torpedoes or other weapons that would be up front.
I have been collecting photos of the Gotland as well as two drawings from Kockum.
Some show the boat tied tot he dock and the upper stern plane tips are exposed showing the Zinc tip bars.
Gotland and Södermanland
And under way, the Uppland
These boats are not the same class.
The Nacken is an A-14 boat and the Gotland is an A-19 boat.
Nacken is 144.4' and the Gotland is lengthened to 198'.
At the Fun Run in June, I saw a few boats with the internal piston ballast tank.
Your Nacken looks like it also has the same type piston tank.
Is this a build it yourself item or is it available?
Is there a build log on it?
That system looks so clean.
In operation I watch one of the other boats hold periscope level for almost the complete run.
It didn't matter whether the boat was under way or sitting stationary in the water.
Control was remarkable.