I believe the hill by Loch Lubnaig is Sgiath Chuil and the little white dot is Ardchullerie Mor - which is the most common starting point for the bagging of Stuc a Chroin and Ben Vorlich.
When my sprogs were...er sprogs, we used to rent a cottage in the grounds of Archullerie and we stayed there for at least seven summer fortnights so we know the area quite well.
Ardchullerie was eventually bought by Jim Kerr (Simple Minds) which put a stop to our holidays there.
fab place for kids by the way - theres a burn top scramble, forests for dens, fishing and swimming in the loch and a rather vicious and tricky pony in the field at the back..... very nostalgic....
You seem to have had some pretty good weather for these trips - I was on the last two days of the TGO Challenge at the time - probably somewhere up Glen Prosen...