This is for a RH golfer, My thought would be this, especially since you say you Do Not want to make wholesale changes to your swing… which at age 70 is going to require work, alot of it. Newsflash!!! No matter what you do, it’s going to require a little bit of work and investigation. 10 degrees is alot and you are losing massive distance. First things first. Start with your grip. You have to make sure those Vs are pointing to your right shoulder, maybe what feels like even just a little past. If your grip is too weak you cannot rotate everything properly with your forearms and shoulders on the downswing, impact and follow through. Too strong, then you get double-cross pulls, toppers, low–line drive banana-balls because that encourages an over rotation of the right forearms, imparting more side-spin on a perfect impact (when you do hit one squarely). Not what you want either because you haven’t changed the path of the clubface problem you actually have. Everything starts with that basic fundamental. Now, another Newsflash!!! If you are able, with a little work to dial your ball flight in, there’s nothing wrong with playing that “slicer” ball flight, Embrace that, just remember your target and alignment is always going to be left rough, ALWAYS! You have to learn, in your mind, your target, with that kind of ball flight might be just to the right of the treeline on the left, or left of the fairway. That takes work too, you need to know which way your general dispersion of like 20 balls are with each club. If you can do that, you do realize you have the golfers dream…you will have successfully eliminated half the golf course… that’s an incredible advantage to have in your arsenal. Your actual target has changed, the end result will lead to more FW and Greens… it’s the finish result of the ball, BUT that is difficult to do, the mind wants to aim down the FW, you have to work on aimpoint, accept that you missed yor actual target by alot. Third, I would bet you a quarter, as far as your swing, you are standing or lifting up prior to impact meaning, you are not completely finishing your rotation around your spine. You must have a total commitment to that swing rotation, if not your release is too early, you are ending up with what is affectionately known as coming over the top or chopping wood. We want to work on limiting that…it is still work with your video camera. Don’t want you to actually change your swing at all, just executing a fundamental of basic rotation. Stop trying to watch the ball going down the aim line! Your head should look like its behind the ball all the way through impact and your right shoulder will bring it up, because it does! That will cut down on that 10 degree, probably by as much as 5 degrees. Still is going to take range work. Really work on the basics, The basics work! If all else fails take a 6packs worth of lessons from your local PGA pro! Happy New Year and Good Luck!