I've now had had the chance to test these issues.
SH3 FileAnalyzer and Sh3 MiniTweaker (both by TimeTraveler) both lack pre-written rules for examining the turmxy_m_hd.sim files. (Found in the data\object\ folder.)
Therefore I have examined the files with a hex editor and, for convenience, written a rule suitable for use with SH3 FileAnalyzer. This one rule works for all the turms, provided the values of 'xy_m_' are changed (eg, to turm9c_2_hd.sim).
I have raised the max_height of the periscopes (types 0 and 1) by one (metre) for all turms.
I have also lowered the 'maximum wave height' in file scene.dat from the previous value of '256' to '224'.
In testing in Single Mission mode, this combination works perfectly for the purposes I require. The periscope can be raised well above the waves even with winds 15 m/s, the U-boat is more readily detected by convoy ships (escorts and merchants), the lower waves give the merchants better stability (they don't rock so badly), and the nauseating effect of trying to watch a closing convoy in a storm is now greatly reduced.
Also the lower waves largely reduce the massive crew fatigue that occurs when schnorchelling. The crew no longer has to switch between diesel and electric compartments so frequently.
Since SH3FileAnalyzer is not as well known as MiniTweaker, probably because it comes with a much smaller pack of prepared rules, I have packaged up TimeTraveler's original installable executable and a selection of my new rules as file 'SH3FileAnalyzer_Build367.zip'. This can be found at:
http://files.filefront.com/SH3FileAn.../fileinfo.html
However, Filefront's new ruthless deletion policy means that you had better download this file quickly, before it vanishes like everything else.
Thanks again for all your help, RacerBoy and Anvart. I hope you may find the new 'Turm' rule for SH3FileAnalyzer too.
Stiebler.