managed descend problem

Hello,
Everything works now fine except descend. I have newest updates for my
A320 setup. Thrust is working fine with its thrust gates. TO/Climb/Cruise are
ok, althought TOC captures a bit late. In TOD plane dives normally but later
I descends only 1000f/min and I cannot reach programmed MCDU altitudes.
I'm above those points and I need to pull to OP DES mode.
Have anyone experienced this?
In FCU.ini there is ALT ACQ FACTOR and it says 5, but should it be 2.7 as a default?
If I change it to 2.7 next time it goes back to 5?