Alexair

Be sure to have the ENHANCED version installed, it's a game changer. You can install it directly from the content manager. That will fix all the blurries.

It depend your weight. On my aircraft (real world but not A310) when we do ferry flights (so totally empty) attitude is negative (around -0.5 to -1.0) at normal cruise speed. So, with the A310 it will be the same. If you're very light then your attitude will be less than when you are heavily loaded.

Trim sound does work on my side, you can hear it if you hold the trim long enough. It is a runaway trim warning so you should not hearing it under normal circumstances, again except if you hold it long enough. Like the EMB-145, after 3 sec you got "TRIM" warning call and the trim stop working to avoid a runaway. Here it's the same except that the trim will not stop automatically. Hope that answer your question.

Yep, got the same issue on my side.

It seems that the WR radar rotary knob inscriptions are wrongfully placed. The TEST position does nothing, the WX return the test, the TURB is the actual WX return and the MAP doesn't seems to be implemented. So, yes, the WX radar need to be in the TURB mode to display weather. Would be good to correct that though.

Yes, you can step climb the A310. The PROG page will tell you the OPT and MAX FL. However, if you are thinking of entering all step climb FL like you do in the MD-11, then no, you can't do that. Hope that answer your question.