You may have already been on this trip - if so how did it go? I assume you're not going this week!
I went in there with a 180hp FP Cessna last January on a high 30's day in the valley. Was circa 150kg under max. Took off on 29 and was surprised at how slow I was climbing out over the rising terrain. A little unnerving even though I'd done the numbers. Heading towards lower ground after takeoff is a good idea I think, at least having / knowing where that option is.