I've only seen one set of comparison dyno graphs for JL3 and Devtour.
At 4,000 rpm JL = 12bhp, D/T = 11bhp
at 5,000 rpm JL = 15, D/T = 16
at 6,000 rpm JL = 23, D/T = 22
JL peaks at 6,500 = 24 bhp
at 7,000 rpm JL = 23, D/T = 26
D/T peaks at 6,800 to 7,200 = 26 bhp
at 8,000 rpm J/L = 16, D/T = 24
at 9,000 rpm J/L is tucked up in bed with mug of cocoa, D/T = 15.
JL4 peaks at around 26.25 bhp at 7,300 but still over 20 bhp at 9000 rpm.
If you want to do the IoW ride out get a JL3, if you want to sit at 75 on the M1 get a JL4, for anything else get a Devtour.
Problem is though that with a different carb or different gearing you could get a whole new series of figures.
Oh and if you don't want to do 9,000 revs why the feck did you buy a TS1.
I rest my case m'lud.