The Ohlins on my 04 Raga was also quite stiffly valved. I went considerably stiffer on the spring for my 250 pounds and then the valving was just about right to control the spring. As far as material for a shock body steel may not transfer quite as much heat but it is considerably stronger and longer lasting than aluminum. On my off roaders when you hit a 20 mile section of deep whoops the steel will stay together much longer than aluminum. After much use an aluminum body shock will take on a slight hourglass shape so then the seals do not work as well and things go downhill from there. For long term use steel bodies are the way to go.