I would be less afraid with the alloy Creo, but the carbon versions are allowed for a rack as well. I asked my LBS for the Specialized adapter on the seat post clamp to fix a rack there. To be safe he asked Specialized and they gave green light. But I would keep in mind the maximium weight limit of the bike. Here in Europa it's 109kg for driver+bags without bike. In my case with 100kg naked driver, not much left for the rack, maybe 5kg for the bags. A few miles I would also carry more, but before I start a long trip with 15kg bags on the rack I definitely have to loose some weight first...You seem to buy a lot and heavy stuff... ;-)
For a hill of 10% gradient you need about 50-60kg extra weight ot nullify the 240W of the SL motor. On a 5% gradient about twice that weight.
Of course you need a better carrier rack (not only with 50-60kg more..) if you ride frequently with a lot of heavy luggage.
If you have 85kg or less, don't worry and go ahead!