Jappachino

RPM lockout needs to be around 4-500 otherwise it will close the throttle when coasting and stall or undershoot when you clutch in.  
Try the map below with the base position closer it will hopefully stop the rev hang.  
For the undershoot after a blip you need to play with the dashpot offset/hold/decay.  I have given it a little more in the attached map.  
Try this 2.pclx

E-throttle target should be zero for idle in G4X.  Note 0% will never actually be commanded since the idle base position value is added to the target (so the least the throttle will ever be closed is 1.8% using this map).  

0% TP is normally the idle position (slightly open, sitting on the stop).  If you do need to adjust the stop position later to achieve correct idle bypass or whatever then you re do the TP calibration afterwards.

Provided the hose is big enough that would work I think.  Obviously crankcase ventilation would be less effective with half the vacuum going through the idle valve.  Typically you want about 16-19mm hose if they are long, may get away with 13mm if they are short.   

1. Should be fine in either of those spots.  
2. Aux 9 or 10 should be fine.  You will need to supply your own 12V supply tho.  
3. Generally if you unplug the idle valve and adjust the throttle stop so that it barley idles on its own when warm you should be in the ball park.  

Try this.  Just a warm log will be ok.
Dylan Altezza basic idle V1.2.pclx

PID has nothing to do with the target, PID controls how the throttle motor responds to error.  Target comes directly from your tables. 
The ECU isnt even trying to control idle in your log because the MAP lockout is set to zero.  You can look at idle status to see what it is doing.  When it is in "Hold" mode the target will be Base position+ offsets (dash pot offset in your case adds 1%).  The MAP lockout needs to be somewhere above your normal idle MAP. 
Try the attached tune, I have made some changes back to more normal settings.  Note I have changed lots so it will likely need tweaks and may not work nice right away, but it will be a lot closer starting point than what you have now.  You can see what changes I have made by using the file compare function.   
Also, you have large counts of APS error accumulator, it looks like you havent done an APS calibration, so do that and a TPS calibration once you have loaded this tune.  Do a new log of a cold start, warmup to normal temp and then some throttle blips etc and I will make some further tweaks.
 
 
 
Dylan Altezza basic idle starting point.pclx

Now that your E-Throttle is actually getting to it's target you'll need to setup your idle base position table properly. Maybe try looking at old logs to see what the tps was while idling previously to get some idea

Yes, your problem is no integral.  Integral is the factor that slowly builds up to remove the last bit of error that is always left with proportional control only.  Try integral at about 0.1.