I also struggled with this. Usually it's better to avoid running on the beach but turns out it was quicker going straight #8 to #9 and #9 to #10, even though the straight line is through the sea! Also helped find #9 which was about 100m before you got to the correct feature.
IMHO it was a flawed decision to use the Yellowcraigs area. The 10 minutes there weren't worth the 15 minutes of dead running to the main area. However, given that they did decide to go that way, they could at least have made sure that the narrow strip of map was up to date. I'm not sure who was most surprised when i popped up on the new golf course above #11, me or the lady playing golf!
I had similar trouble at Oban last weekend, but at least there the controls were in the right place. I took the beach for most of the way to the dodgy boulder but was on the path for the last 100m, so found the boulder some time before the flag. I was also very confused around 11.
There had been a lot of access fuss right up to the event, which I'm sure didn't help, and I would have expected better of what I think was a brand new bit of map for the coastal strip.