Hops, sounds like you've had a better success than me, I had much the same temperature drop when mashing in on my first AG two weeks ago. However, on the second night in the FV I used the heat band on timer when I should have left it and it got to 27c which is beyond the temp range of the US05 I'm using and I'm worried I'll have off flavours. I'll just have to see how it goes, funny a year of doing kits and I do my my first AG and its schoolboy errors left right and centre.