It is always great to post the runs that are successful, but we learn more from th ones that.....well, have issues.
I did a run in the pool to test out the trim as I have added do-dads. It began well.
She was running well on the surface. (forgive the grainy photos - night time, crummy camera)
I like the running lights! Yet around the pool she seemed to be slow in responding and sluggish. Normally she is able to make the turn in the pool, but tonight she could not make the turns, I would have to do a two or three point turn and it seemed to get progressively worse.
I sent her under to see if that helped.

It did not help her performance.
There is a threshold of about 2 - 3 feet that my Gato goes from positive buoyancy to negative buoyancy. From my diving days, I remember that on the initial descent, that first 10 - 20 feet there is a lot of adjusting of BC/mask/ears so you would not get the squeeze or sink too fast. At 3 feet under the air volume is reduced about 10% (going off memory - please correct me if I am way off) so somewhere in that pressure. It changes things in my sub.
There came one point that I was going too fast (just seeing if forward speed affected the turn rate) when I had to put the sub in a quick reverse because a wall was coming up quick.That brought her below the positive buoyancy and she settled down to the bottom.

I tried to maneuver her up from the bottom, but this time there was no turning at all.
Fortunately my son (8) was thrilled to be the emergency diver and eagerly retrieved the sub.
Dry dock report:
In the emergency reverse I had disconnected the rudder. As far as sluggish turns, one prop was not moving. It turned out I striped the threads.
You may ask "Tom, why did you not use your gas system to come to the surface?" That is a fine question and the answer is....... I ran out of propel and thought I would not need it in the pool. Crummy answer, but true. Lesson learned.
The best part is the man who designed the system is graciously going to send me a new gear. That is cool!