That's a pretty fair assessment. Aside from a few options needed at 8 and questions in a couple of spots about who's third choice, the pack is in great shape, but as you say, the backs just haven't clicked. There is plenty of talent there and they're all capable of excellent individual play, it just never seems to happen that they all play well in the same game. Instead we get stuff like the Ireland game where May has a stormer and that, coupled with the pack's play, is enough to offset the rest of the backs struggling and get the win.I haven't really commented on England so here goes. This Autumn looked a bit like Autumn 2017 to me except the foundations are far, far better. I wouldn't be surprised to see them go 3/5 in the 6n and pick up another loss later in the year but only if Ireland and France get it right. (both should but there's questions remaining over the management and coaching of both)
I can see why fans would be frustrated as a result, last time very young lads needed to be brought into a team with weaknesses which is something international coaches are bizarrely afraid of doing. This time, with the exception of 9 and 10 where you're weak if Farrell remains out of form, the players are there it's just the combos that need figuring out. Despite having some pretty enviable options you seem miles away from getting a settled midfield and the back three always seems to be Johnny May (good) Elliot Daly (serviceable) and some lad in middling form. It could be a case where a loss or two will force the change that's required, hard to change a winning team at this level.
All that said I think your pack is being managed perfectly which is more than enough to guarantee being a top 3 team in the world right now.