Hi Guys, I've been following your training schedule and I know I'm not joining in all this training madness but I kinda agree with Mark and Allan. Why not try the hill from Lochwinnoch over to Kilmalcom or from Lochwinnoch up to Muirsheil visitors/info centre for the old mines, this 2nd route is at least 3 miles long and the climbs is only about 300m on a very quiet road.
Hope this helps.