I definitely wonder if it's a boat width or boat weight issue, instead of your oars. If you're rocking the E series like I do, you will be rowing harder than folks with a narrower boat( but flipping less in the big stuff, they are great boats!!)
Longer shafts and or bigger blades, will give you more power per stroke, but will also require more power per stroke, and longer oars will mean each stroke takes longer, which will be bad in small technical rivers. Can be a good length for big rivers like cat though, lots of flat water, and the rapids are all about the set up.
I usually run 10' with 9' spares, with extensions. Got to run the Rogue last week for the first time, and was glad I could switch to the 9' oars for Mule Creek Canyon, the tens were a bit much on that river. Really would not have minded something smaller then my 8" blades to.
Great to have options sometimes.
To go with a bigger blade, you would probly have to go back to Carlisles, which have the annoying problem of catching on your leashes if you pull them in all the way.
If you do want to upgrade, spend it on shafts, and keep the 9' as spares, but those Carlisles are probly fine, mine have seen me through a lot.
"All we need is four million dollars"