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Mashing with larger grain bill / high volume water

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RyPA

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For my last 2 NEIPA batches I used the below amounts/volumes in a 10.5 Foundry

Total water: 9.2 gallons
Mash: 7 gallons
Sparge: 2.2 gallons

Fermenter volume: 7 gallons
Keg volume: 6ish gallons - I fill a Torpedo 6g keg

Grain: 17.5 lbs, 1lb being wheat malt, and 1lb rolled oats
1lb or a little over of rice hulls

Mash efficiency: 78%

My problem is my mash temp towards the top is in the high 140's and I was aiming for 154. The mash recirculation has to be on very slow or it will begin overflowing out of the malt basket. What I ended up doing is lifting the basket every 8-10 minutes or so minutes and let it drain, then put it back in and put the recirculation return on top to get some hotter water onto the malt at the top, then stirring the top half a bit.

How do you guys manage a decent flow rate and desired mash temperatures when working with similar volumes/lbs of malt?
 
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