Very nice. I have observed very same behavior of the pressure.
When I saw this behavior it looked quite crazy. Then it jumped to even higher pressure than initially was in the tube which excluded any leak.
I think that what we have to do is as fast as possible hydrogen release to initiate LENR.
And this loading/releasing cycle is what I have talked about in regards to "breathing". It should be performed periodically to maintain excess heat for long time.
As soon as we will be able to control the pressure on will, it will just work.