The 175 with the enhanced winglets are definitely more susceptible to floating compared to the older style winglet. Comparing 175v170, I probably least float in a 170 overall.

As others have said, Performance numbers are based off of coming over the threshold AT Vref, not Vapp. At our company, our Vapp is +5kts with a max of +15kts over Vref. With Ice speeds, I normally only do +5kts to Vapp since your carrying all the extra speed anyways.

Also make sure your looking down the runway. When your flying GA, there is less pressure on you and you do things naturally. At the airlines, you have another pilot and possibly a jumpseater watching, 70-76 people behind you judging you, as well as the plane itself reporting what you are doing. When I was still relatively new, for some reason right around the 200-300hrs mark, I really started floating a lot and would land towards the end of the touch down zone. I was flying with a pilot over a 5 day trip who had been on the plane more or less since day one of it flying at the regionals and she watched me and noticed I was getting fixed on the Touch down zone without even realizing it. Once I got back to the basics of looking down the runway and really learned the sight line of what it should look like, it was back to normal.

Your always going to have those random landings or trips where it just doesn't work. That's when you just say "Welcome to _insert_crappy_city_" and you laugh about it. And then when a passenger tells you about your landing you ask them: Are you at your destination? Did you arrive here safely without injury? Could you have done it any better? Have a nice day...