Lemon tree has yellow leaves
About a month and a half ago, I moved my lemon tree from a commercial peat based mix into the 5-1-1 mix, though I left out the peat and the lime/gypsum portions. When I repotted, I cut off at least 2/3 of the roots.
I have got a wooden dowel in the mix to monitor moisture level, and I have been watering before it dries out, every 3 to 4 days. I am feeding with FP at 1/4 teaspoon per gallon at every watering. Until about 2 weeks ago, I had been adding 1 tablespoon of vinegar to the solution because that volume was stuck in my head for some reason. I decided to check the pH and found that it was at 4.5! So I cut back to 1/4 teaspoon of vinegar per gallon. I haven't yet tested the pH of the new solution, but it is roughly 10x less vinegar so I am guessing that it is probably a little above pH 5.5 (but I will be testing soon). And when I water, probably about 1/2 of the water drains out.
I've got the tree inside facing east so the tree gets some sun but probably not enough, but it's the best I can do.
About 4 weeks ago I noticed a some yellowing leaves. Then the tree got better. About 2 weeks ago, the yellowing came back. I have been advised that leaving the lime out of the mix was a mistake but have also read that it is OK to leave out because the pH of the water matters more and I have Mg/Ca in the fertilizer solution. So, I am a bit confused when it comes to this subject.
I am looking for suggestions on what to do. Should I take it out of the pot and add some lime? Should I flush with tap water (pH around 6.5) to sort of flush out the acidity? Or does it sound like my problem is unrelated to pH?