Bike fit--road v. tri-specific

Same here ... I think tri bikes tend to size downwards.  Best to get an experienced first hand opinion when you are sitting on the bike. There is plenty that can be done to tweak a cm here or there ... but believe that it might be better to get the proper size and have the tweaking done to dial in your fit in a micro rather than macro manner.

Further, there is more to getting fitted on a tri-bike than just the seat angle.  There is the position of the body over the top tube, the drop between your seat post and arm rests, seat position relative to the cranks, and the list goes on ...

A good fitting often takes over an hour (mine took close to 2 hours) as they dial it in ...

Bottom line: Yes, you should get refitted ... and if you purchase the bike, you might want to make sure that the fitting is included in the price (and that it will be done with someone who has the proper experience + expertise).