OK I found a secret.
.
I modified the proper cfg file but ....
To save my time, I changed the mast in cfg and just restart z test mission. I've just look at rec manual and value was changed but ... the value in notepad was old .
I restarted teh game and now everythink is ok. So the conclusion is that the game loads mast value for stadimeter when the game is starting but the value for rec manual when mission is starting.
Thanks Makman for your idea to look at notepad, I have just forgot about that.