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I've used this as a reference in the past. Look for "mill gap experiments". At least for his system, the finer grind increased efficiency. http://braukaiser.com/wiki/index.php?title=Effects_of_mash_parameters_on_fermentability_and_efficiency_in_single_infusion_mashing

I'm hoping to use a Love TS-13010 to control temperature in my HLT. From what I've read, the thermistor that comes with it is not water resistant, and people seem to have a hard time controlling HLT temperature with a thermowell. Does anyone know any alternative probes that could be used in...

I'm not really sure if contamination is a concern when the yeast are this active, but I've always put a sanitized tea saucer upside down over the hole until it's safe to put an airlock back on.

There are a couple different definitions I've seen, so you need to be careful what you mean. If you're defining efficiency as the fraction of the grain mass that ends up as extract, then low-to-mid 60's is not bad at all. Some 20-25% of the grain mass is in the form of husk and other stuff...

If you're brewing to win a competition, it matters a ton. The mouthfeel of the beer will be completely off if the temperature was off by 4 degrees. The saving grace is that unfermentable sugars don't tend to be all that sweet, so the beer's flavor is still fine. So, a high mash will give you...

Assuming the cold break already separated out, that's pretty reasonable. I can usually easily read the hydrometer through the wort.

I usually wait for the yeast to drop out on its own rather than cold-crashing. The downside is that it means I have to plan in advance.

I wouldn't worry. Cool temperatures, yeast pitching procedures (not using a starter), high gravities, etc. all can make a fermentation go longer. I've had strong lagers bubble slowly away for 3 weeks.

Why not?

Used whirlfloc for the first time today instead of Irish Moss. Produced the most beautiful cold break I've seen. After 15 minutes the wort in a flower vase I use for measuring SG had completely separated into crystal clear wort one could read a book through vs. cold break on the bottom...