Aye Steve,
Further to Ian's comment re. rear shock length and the corresponding alteration in the rake of the front forks, lengthening the rear shock absorbers, reduces of the rake of the front forks (tucks the front wheel under the frame!), so speeding up the steering, making the machine more nervous, or quicker to turn into a corner. Conversly, shortening the rear shocks, increases the rake of the front forks (stretches out the front like a chopper!), slowing the steering, making the machine more stable in a straight line, but requiring extra input to get it to turn into a corner.
10 mm difference from OME specifications may not seem to make much difference, but it does and anything greater than that certainly does!

When I fitted a pair of ex ISDT 330 mm rear gas shocks onto the Ducati, when I was across, because they were gratis and the Cerianni 310 mm factory fitting were shot, without changing the forks in the yokes, it became a nervous machine, upset by road imperfections and the front felt as though it fold at any moment. Needless to say a pair of shorter 2nd hand Hagon 310 mm shocks were found and some control was re-stored. Not that travelling down the Druidale Road in the company of the Manx VMCC, off-season, in the mid '70's was ever a controlled, gentle whiffle!

Good health, Bill