Mity Mo

I am trying to get a feel for how the Ecoboost works with the 4" lift and 35's. I had a 14 Platinum with a 5.0 that I put 35's and a 4" lift and it wouldn't pull a trailer well. It was really fighting to stay at speeds of 65MPH. Always seemed to bounce between 5 and 6th gear which drove me nuts. Now it only had 3.55 rear end as well. I am wanting to lift my 15 Platinum but want real world experience from someone who has had it for awhile with the Ecoboost. Is there anything strange you have noticed? My new truck has 3.73 gear and max trailer package on it.