It sounds like they didn't do a very thorough job of fitting you? A good fitting should take at least 1 -- 1.5 hours, with plenty of observation of you pedaling on the trainer -- on the hoods, on the drops, etc. In addition to their observation, they should be willing to try different stems, etc, as you direct. If you didn't get this from the shop when you bought the bike, you should make an appointment to go back. Most shops will either include a fitting with purchase of a new bike or will at least give you a discount. This doesn't mean that you might not want to tweak things even after the fitting, but it should give you a better baseline than it sounds like you have. Did they have the Orbea in the next size down (or do they have a different model Orbea with similar geometry in the next size down)? Might be worth trying it for comparison.

Good luck .