if you are serious about looking for another cross chalange, i have one that i have wanted to do for a few years. it would possably be slightly tougher than to days paddle.
over the erskine bridge straight on up the hill on the road and track to loch humphry,the track is good but steep,keep heading north over the moors to fyn loch,pond wood,duncryne road,old school road,old millatary road(a811),then hove via balloch.
it would be a belter of a ride/carry
iain