That looks like a fine wee cottage that you had for your stay...I bet that it felt like a five star place in weather like that....the July weather in Scotland can be very unpleasant....have had many trips to the North when the hill plans were spoiled....especially in days when holidays had to be taken in July.
One way is to keep an eye on the forecasts and go...not so easy when you have to arrange, in advance, leave from work, a holiday place to stay etc....easier with the tent/bothy combination but that too can have it's downside
Just have to keep coming to the North.....fifty% sucess rate acceptable?