Something I doscovered during my F1 build was that despite the fact that there are 4 bolts holding the clutch plates 'together' you cannot fit the clutch inner and outer together in anyway you like, get it wrong, like I did, and the splines don't engage properly at the back and the clutch will not disengage. Try slackening it off and reassembling again with the basket 90 degrees out to the way you have it now, it might improve things