The E170's are weight critical on the MAD route. If it's anything like the RJ's, you'll need the weather to cooperate to accomodate the extra weight in order to make it with a full payload.
I would like to see the E190 on the MAD's but I don't know if that would work performance wise. I haven't seen it in the system and I'm not on the E-Jet yet.
However, there are more improvements coming. As it's still a very new type its 'work in progress' and more performance enhancements are being worked on. We should see thing improve over time. I've seen it leave LCY with a full payload, so it can be done. So apologies and hope to see you on the MAD once I'm on the 'electric jet'.
