Dick's right, at this size unless you really go out of your way to bodge things up then tricky stalls is not an issue in this size range. I'd also reconsider your "goal" of 1.25 kg. That's far too heavy at that size to make a good aerobatic model. You'll want to drop that down to around .8 kg. It should not be that hard to do at all. Even the chunky EPP foamies are coming in at around .6 kg in the 0.9 meter span region.