Ha! I hadn't even considered wheel diameter.What size is your wheel btw?
With a 28cm wheel I ran about 60% base strength, with a 32cm wheel I ran about 90% base strength of my csw 2.5 (8 Nm)
Yeah, I'm running an Ascher F-28 also - and my other wheel is 270mm. I didn't realise how much more torque it would make over a slightly larger wheel! I run mine at 60% in-game with the Simucube software at 100%.
Mystery solved - thanks Rasmus