Ok i can't believe these topics still get brought up when it has been covered so many times before.
The popping/stuttering is called missfire. It is when the spark plug is literally blown out and cannot fire to make a clean burn. Therefore it is a spark issue, ie spark plug or coilpacks.
The stronger the ignition system in the car, the larger the spark plug gap can be because the system can create a larger voltage and ionize the air (gap between the spark plug tips). If the ignition system is weak than it can't ionize the air properly and will not fire, if the gap is too large same thing happens. (Think of a static electricity shock when you get zapped, the potential of the object zapping you is a lot higher then your body and the object tries to reach the same potential between you and it so it ionizes the air and causes a bridge and you get a zap. The larger the potential difference, the greater the zap and the greater the distance between you and the object can be.)
So there are three fixes:
a) if the ignition system is fine, lower the gap between the spark plug tips until it stops missfiring
b) upgrade the ignition system so the spark can fire across the gap properly as yours is obviosly not up to scratch
c) do both
To me if it is still missfiring at 0.8 on such low boost it will most likely be the coilpacks, but you can gap them down furthur to .7 or .6 to solve the problem for the time being, however i'd borrow some coil packs from someone and test them.
As to the iridium plugs, easy fix, don't use them! Iridium/platinum plugs main advantage is that they last a long time compared to coppers. However it is better having a fresh set of plugs in the car all the time than it is to have some sitting in there for years, even if they still work ok. In most modified cars, plugs foul up quickly, so having a set of fresh plugs in the car every 5000-10000km is usually the best option. Also, most iridiums/platinums run a 1.1mm gap which is fine for most stock cars, but with most of us running more boost and airflow over stock, 1.1mm is usually too big and causes issues unless your ignition system is in very great condition. Gapping iridium/platinum plugs is not recommended as it damages the tip of iridium/platinum a lot more than it does to copper.
Just use BCPR6E plugs (or the heat range that you need) that are pre gapped to .8 and change them every 5000-10000km and i can gaurantee the car will run fine (if your ignition system is in good working order) and you'll still have money left over in your pocket with paying $4 a plug compared to $30-$40 a plug.