I use Schwalbes as well on my MTB, they're lightweight but not as grippy as some, I never run them above 30 PSI, hardcore MTB riders run tubeless (not me...)
If you're after lightweight there are available clear tubes that are reportedly puncture resistant and lightweight.
http://www.bikeradar.com/au/news/art...r-tubes-36351/.
Cell Bikes have a tube brand called FOSS which are the same.
http://www.cellbikes.com.au/Bike-Parts/Tubes