I felt we got turned over far too much in the 6N when we went wide and started looking like making breaks, so saying it mostly looks like the 6N pack doesn't look great to me
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I will have a more complete answer for this in time assuming my current boredom continues, but looking at the Ireland game, the one where we lost the most rucks...
1st ruck lost - Ford receives exit box kick with no support and a ton of Irish chasers; no shock, only real question is why ask Ford, the single worst-equipped player for the situation, to be standing there? Might have got away with it with, say, Billy.
2nd ruck lost - Alex Goode receives exit box kick but is able to offload to Nowell, who offloads to Hartley, who goes to ground and the ball is knocked on somewhere in that ruck
3rd ruck lost - Kruis receives the ball out wide when counter-attacking from a kick and decides to straighten; Sean O'Brien gets over it and Owens calls England advantage over. However, there were forwards there; Cole, Hartley and Marler were all in attendance. But Cole slid straight off O'Brien and Hartley and Marler couldn't wrestle him once set. Maybe slightly slow to get there?
4th ruck lost - Pretty much centre of park, Billy steals a few yards off of Henshaw in the tackle and maybe gets a little too isolated; Best is over it, Cole slides off again, Haskell can't stop Best ripping the ball, my notes say Attwood was there too, I can't recall what part he took but it can't have been useful.
5th ruck lost - Burrell get eaten alive by Sexton and Henshaw after his dummy isn't brought following the half-backs shovelling on the ball after the maul nearly goes into touch; if Burrell had also shovelled it on there was an overlap on. Instead he got banjaxed and penalised for holding on.
6th ruck lost - This comes a few phases after the big break Ford made up the middle (which notably got plenty of support). Robshaw carried in, Attwood's right there but failed to do anything to the jackal, Ben Youngs is the next man in, Kruis hits hard but is too late... we're about 10 out from the 22, 20 in from the touchline, third phase of possession after a break, there's no excuse for the forwards not to be there.
7th ruck lost - Sexton kicks in behind Watson, Watson and Goode both go for it and collide, Zebo wrestles Watson off feet too easily for my liking, England are having to flood back and Ireland drive over and pick it up. When Goode, Youngs, Ford and Joseph are your guys in the ruck, you're screwed. This one led to Henshaw's try btw, so yay!
8th ruck lost - Haskell takes on second phase after Alex Goode's kick return. Robshaw, Kruis and Marler were waiting but fail to shift Martin Moore's gigantic posterior. Support was there, although Robshaw has to check and turn in approach to ruck, while Marler seems to fanny around somewhat.
Now, admittedly, Ireland isn't the best example, as England didn't really do much in the way of expansive attack, and what we did got let down by Nowell getting bundled into touch, Watson developing bad colour-blindness when offloading, and Twelvetrees' passing, but we are perfectly capable of turning over the ball in any situation!
There's the odd occasion I think where I look at England getting turned over and think its mainly due to a lack of support in the area (Ford vs France might be another), but most of the ones I'm seeing, the support is there and the support is inadequate. So far the closest thing I've seen to what you say is Dylan Hartley charging off from the back of a maul against Wales... but assuming it comes up only once a match or so, I think that's still overall a win. And a more physical, industrious backline would help in this situation nearly as much as more pace in the back row.
edit: I'd also point out that Youngs and Ford rarely break out wide, but instead tend to go through fringe defences, which lessens the stress on their supporting runners.