How do you get your effeciency up

[northern brewer]

josephus wrote: Your efficiency will probably go up if you go with a thinner mash but it will take a lot longer to boil.

Another disadvantage to a thinner mash is that it will alter the body of the finished beer. I don't think that this is a worthwhile method of improving the efficiency of the mash.

[Speyedr]

When I was doing 5gal batches I had the same setup, stainless false bottom, Phils Sparge (fly sparge), etc. My efficiency was in the upper 70's to low 80's ALL the time. I'm now on a 10gal system from B3 and I'm batch sparging. Efficiency is suffering but I'm still dialing it in.

Check the crush, but check the pH of your water and of the Mash too. My water is really good for brewing and doesn't need much added or taken away to do most styles, but that may not be the case where you are. If you can't check all of this, make a dark beer and see what your efficiency is. The dark grains will bring the pH of the mash down. If your efficiency goes up it's a pH issue.

Good luck!