Phaser not working properly

Hi all!
I hope you can help me out. I just finished the Phaser and it does work, but not properly. So I measured the values.
I know where the problems are but don't know what to do. It's the second kit I built, so I'm a newbie

IC 1, pin 3: 3,95 (should be 4,9 V)
The rest is okay.

IC 2 and 3 are okay.

Q1, Q2, Q3, Q4 are not okay. All of these have the same values for S (4,9V), D (4,9V) and G (1,7V, which is too low).
Q5 is okay.

D1 is 4,97 (should be 5.1V).
So, what to do?
Am I losing voltage somewhere on the board? But it's not much. I think pin 3 of IC 1 is and the Q1-Q4 are the main problems right?

I hope someone can help me out!
best, William

BTW: I used the pdf with operating values and measured to GND (input jack).

Any tips or suggestions? Or is more information necessary?

I hope these images help. I can't wait to work further on the project, so please help me out!
[ATTACH=CONFIG]13596[/ATTACH][ATTACH=CONFIG]13597[/ATTACH][ATTACH=CONFIG]13598[/ATTACH]

Okay, I fixed a few issues.
The only thing remaining is:
- IC1, pin 3 gives a value of 3.35V (instead of 4,9V which it should be)
- D1 is also a bit lower than the 5.1V it should be. It still measures 4.97V

Can this be fixed?
Any tips?

Hi Bernd,
yes I adjusted it, so the Q1-Q4 issues solved this stupidity
But IC1, pin3 and D1 don't change when the trimpot is adjusted. So, something else might be the problem there.