Keeping the feet closer together (not touching, duh) makes it much easier to take them away from under the body and find balance on the outside ski. If you don't feel like posting video publicly, you could just PM it to Jamt or others.
The proper weight distribution inside/outside on groomed is 0:100 so how about practicing 0:100 for a while, i.e. do Javelins and such for a couple runs, get a feel for that outside ski balance. Then it will just become a matter of not forgetting about your unweighted inside ski while it is skimming the snow... Do remember how the brain amplifies feelings: when you think you are 1:99 in reality it would be more like 30:70