So your n+1 has exceeded the s-1 upper limit?
Still trying to get another n+1 snuck in, but I'm fancying a Di2 gearing system as constantly re-indexing my 105 setup is a PITA, so the costs are a smidge high.
Think the last time I rode my mountain bike was about a year ago for 20 miles or so.. after the first 3 I was knackered.. felt like I was spinning like a hamster in a wheel, but going nowhere..