Adventure for levels 10-11

I had a group complete the Curse of the Golden Spear series of 3 modules. After a short break we are getting ready to start back up again.

I'm looking for suggestions on what to do next.

I would most like a module or series of adventures that can be run fairly close to RAW. I am not the best at making up stuff. Especially if I have to do it on the fly. For that reason I don't like some of the real 'sand box' type adventures that allow nearly anything. I don't want to railraod them, but I need more write up for the expected options.

The last module I found I was needing to beef up the encounters by at least 50% or they were almost not worth bothering. For me that is a pretty fair amount of difficult work to up an encounter sufficiently without causing a TPK. I can't judge very well so I have to take the time to practice game it out. I don't always have that much time.

Any suggestions?

If you find converting from 3.5 to Pathfinder to be easy, try the Heart of Nightfang Spire, just take level two and three and smoosh the important bits together and just use the map from either one. Otherwise, it gets a little tedious.

Overall, it's a fairly fun dungeon crawl that was challenging for my 10th level party.

As far as adjudicating on the fly, I will add or subtract HP and special abilities from monsters depending on which side is getting their rears kicked. It should rarely come down to one roll, but if it does, just roll behind the screen and make what you want to happen, happen.

Just don't over-do it or else it becomes you playing and everyone else watching.