LOG means that core reached the thermal throttling temperature and the CPU logged that internally. When you reboot, this data is cleared from the CPU. If RealTemp says HOT, that means thermal throttling is in progress. Glad to hear your new cooler is working out for you. I am planning to buy one of those too.
Go buy one my friend. I assure you you'll never regret it! Get the dual fan version! ITS REALLY WORTH IT