I have a 2015 Duke 690 and love it like no other bike I have owned (13 in all). I have been waiting for the 790 to arrive in the USA and am told that it will not be here until the end of this year. It looks sounds like it has overcome the only thing my Duke is lacking, top end. But the added weight has kinda crushed my dream. How much better do is the 2018 engine? The rest of the bike seems the same. Your thoughts