AG Starch conversion issues and PH

[Bighorn6]

I am doing an AG mash (9 lbs corn, 8 lbs oats, 7 lbs 2 row barley malt in 12 gal water) and I am not converting starch. I steeped the corn and oats in about 10 gal water started at 205F. I added 2 tlbs limon juice. Didn't budge the ph. I tested the lemon juice and it's ph was 7 which I found odd. Left it wrapped in blankets overnight and in the morning temp was just above 150F so I added the malt. PH of the mash was still 7. Bought some citric acid at the store. Tested that before adding it. Tested the citric acid powder it was 7. Tested citric acid in distilled water that was about 6.8.

Temp is now down to 90 and it's been 12 hours since I added the malt. I did the iodine test and it appears my starches didn't convert.

I am guessing that the ph caused either the malt not to convert the starch and/or the grains not to gelatinize but I did this recipe before without any pH adjustment and it had a low SG but converted for the most part. I thought I'd try and lower pH this time to maybe get a better conversion.

Questions:
1) Why is my lemon juice and citric acid that I just bought from the store at a pH of 7? Has anyone else seen this?
2) Is PH the most likely the issue here or should I be looking more into other possibilities?
3) other than turning this into a sugar wash is there anything I can do to salvage this mash at this point?