Mini Mash - sparge question and boil amount

I've been playing with numbers and found something that raised a big old "?" above my head.

Main question - in a mini mash is there a problem with "sparging" or rinsing in this case with MORE water??

I ask this because . . . ..

I normally have been working with LME. Adding LME to a boil is adding liquid and I was making sure the PH of my water was correct (using Gravity points and amount of LME and so forth).

However - switching to DME I'm no longer adding liquid to the wort and thus my total wort being boiled will be slightly smaller.

SO - to make this up I thought I would just sparge (rinse) with more hot water.

Comments??

Main question - in a mini mash is there a problem with "sparging" or rinsing in this case with MORE water??

Click to expand...

Yes. Oversparging alters the mash PH and can lead to extraction of tannins, leading to astringency.

Should have add this is a partial boil also!

So would you suggest to get my boil up to 2.5 gallons just add water?

If I start with 2.5 gallons
The mash grains will reduce the volume to 1.7 gallons
Sparging will make it 2.2 gallons and I want 2.5

Just add .3 gallons of water to the wort?

Or am I being water obsessive LOL