Sure. It was all about to lubricate properly the poppet. For some reasons I was not doing in the correct way. That fixed my cranking effort and lack of VIVA.Good to hear.
If possible it would great to hear the advice you were given as it could be of benefit to many.
For the flow issue it was just an IP ajustment issue. After servicing my first stages and adjustuing them properly now their IP is 9.5 bars sharp, no drifts, and they can be long time with no IP variation (I left one of them near 24 h under pressure and the IP didn't changed)