I think this is a big part of my problem too! I have tried leaving her for an hour in the past, but she doesn't settle back to sleep, and am actually revisiting that now. The only way she will is if rocked- something I don't do often, only when she is way ot. Even then she has a hard time settling, she will have jolts & stir at the littlest thing. I don't see how she can settle with wi/wo, sh/pat, pu/pd since she has such a hard time resettling.
My problems started when she was 4 months & got worse & worse. Of course by the time I started doing something about it, then got it right I think she just got so used to the 30 min naps! She is almost 10 months (8.5 adjusted). Right now I am extending A times, which I also tried a couple of months ago. Luckily I have night wakings under control some of the time. On her good nights she will go 9-10 hrs straight, and when she actually has a good nap day she will go 11-12 hrs straight!!
Any advice?? PDX please keep us posted, I am interested to know how & if you corrected this, thanks!