I'm the same height as you Colin and in my 95 Plus 8 (now sold) I took off the drivers seat runners and bolted the seat directly to the floor board. This did the trick regarding vision but of course there was no ability to slide the seat forward which was a problem when someone else needed to drive the car. I did also look into getting smaller seats but there is very limited width to accommodate racing type seats, could be a fix though if the right seat could be found.
Bob.