I’d suggest waiting for June when concerts in Europe start. If the setlist stays the same then, it will probably not change for the rest of 2015 OTRA dates.
You don’t have to spend money on OTRA tickets if that’s not what you really want. Just make sure you don’t regret not going.
I had a chance to go to TMH show in Amneville (France) in April 2013, and I didn’t. Still sad about it (Over Again is my favorite song and they dropped it after 2013. I’d pay a fortune to see it live).