Eggs won't ever be as large,but that is the trade off for having a nearly non stop layer. Knock on wood but iv'e never had any reproductive issues with the doms either. I think the consistent medium egg size is easier on them.:)
Yes they can. And you've got to factor in less losses due to infighting and predation. Doms are much, much better at avoiding being eaten. No winter break, and the ones here laid through molt. ;)