I have a Buckfast hive, local Ontario, a Manitoba, Russian, Italian. No carniolans. I really like the Buckfast - gentle, good producers, made it through the winter strong - and I've heard good things about the Carni's. I think you'll have a nice hive with that mix. Hopefully someone has buckfast/Carni bees and can comment on the specific mix.
Wait - YOU have that mix, or will soon! Let us know. :-D