Pretty useless and dickish of a response that shows you didn’t even read the post. Hopefully someone else here has something more useful to contribute.
You're right, I just scanned the post and saw ridiculous numbers. Looks like there hasn't been anybody else to step in and answer his question though.
Of all chillers, immersion chillers are the least efficient. I rank counter flow chillers as less efficient than plate, but dont want to get into that argument. Either way, counter flow ought to be more efficient than immersion.
I stand by my original point. I had no problem at all chilling just yesterday 13 gallons of water below 80 degrees with ground water that was 72 degrees using my immersion chiller.
A counter flow chiller, being more efficient, should have no problem meeting that standard. Either, once again, the numbers are a lie used to just exaggerate a point, or the equipment is being used wrong.
Take offense and say I've got a dickish response all you want, but you also didnt take the time to help the person out.
To answer the question as to why his cooling blows beyond all measure, check the following.
1-Are you getting clogged at all. If wort cant flow it cant cool. Are you sure of this throughout the entire boil.
2- Are wort and water flowing opposite of each other. It is important to get your inlet/outlet oriented correctly.
3- Are you doing one pass into the fermenter, or recirculating? If doing one pass, wort out speeds will need to be slowed. Water speed should be at a maximum. If recirculating, just let it all flow naturally without restriction.