I have rapped off an abalakov made with a 14cm stubby. It worked fine.
We tested an Abalakov by chipping away at the central ice with an ice tool. It held repeated two-person bounces down to about 5cm thick, then suddenly fractured.
It's been "new" since the early 90s in North America. The Russians invented it much earlier. '
I rarely rap off a double Abalakov unless I'm using a new one to back up an old one. Just leave a screw in for back-up till the last and lightest person comes down.
The vertical offset can be a good idea but sometimes with thin ice you have to use whatever works.
The big problem I find is that the longer the screw you use the harder it is to get the two holes to line up. If you only have a little bit of ice, or a bulge, you don't want to be drilling too many holes or else you will be rapping off Swiss cheese.
If you can avoid it don't drill an Abalakov in the outside part of a bulge - the ones that would dinnerplate off if you hit them with a tool will plate for other reasons too.
I find 6mm or 7mm cord, or the 9/16" webbing works the best.
On popular routes add a quick link or rap ring to the webbing cause someone else will be using the same anchor most likely.