Couple of things I would check (I've been working to understand these functions myself since I hate how long it takes revs to drop on the 1-2 shift and may try to reduce the time a bit.)

Have you been through BBSAWE/fuel cutoff?  Could be a place to start/continue.  From this thread:  http://nefariousmotorsports.com/forum/index.php?topic=1710.15 Reply 19/Setzi the IDC sets whether the injector fires or not after injector on-time is calculated.  So even though you are showing that there is no fuel cut off, there still could be shutoff going on for some reason.  As an easy check, maybe increase KFTVSA, delay fuel cutoff on gear change (detected by the clutch switch, b_KUPPL).

Maybe you have changed things up enough mechanically that the idle PID should be looked at.  The Alfa FR page 570 (LLRM) describes the PID and how to go about tuning it.  Easy enough to put back to stock if it doesn't fix the issue...

(As an aside, somewhere in this thread someone mentioned torque reserve in the context of opening the throttle.  Torque reserve alters timing, not throttle position.  Increasing reserve pulls timing compared to base so that higher torque (from increasing the timing) is immediately available to react to loads.  Much faster than opening the throttle.  On the one hand, lighter flywheel = less inertia to carry through a starting load (A/C engaging for example).  On the other, it's easier to accelerate the load with a lighter flywheel -- so maybe less torque reserve is needed, not more?)

I was thinking it wouldn't be just the starting load but the constant load after the accessory has been engaged.  like while the A/C is running, alternator load, PS pump, etc, or while all of it is happening. So a spike and then constant load. The ECU, I'm thinking would be using up more of the available timing with the lighter flywheel compared to a stock unit installed, If there were no changes made to the software. Does that seem correct?

I haven't found a thread in here yet that really goes in depth about what to change in the software for light flywheels or switching from a dual mass to single mass.  I'm thinking idle fueling would be needing some refinement because it should take less fuel to keep the lighter flywheel turning right? or will it take more because the lack of inertia compared to the stock flywheel?

Who wants to start a light flywheel thread?

Could this be causing my stalling issues? What is the general increase needed?

EDIT: I don't seem to have any of the idle PID components in my map pack, so I have been trying to locate them with a fully defined TT file. Not sure they are the correct locations. Don't mind the axes, I haven't looked into them yet.

pooched injector seals.  barely ever stalls now, dips below idle often though.