"All-Ball" Gorilla Zkittles Winter Grow

So this week was going well until I noticed some spots on some lower leaves as well as wilting.. I decided to flush the soil with water Ph'd at around 7 and the runoff was coming out around 5! I added about 7 tablespoons of dolomite lime the the surface of the soil and flushed again with water around 6.5 and it came out around 5~5.5 again.. I don't have the exact PH because I use General Hydroponics ph test kit which is the type you have to compare the color of the liquid with the ph color chart which they don't actually include?! There's a nutrient availability chart and a chart on the label of the test solution but they don't match up so it's confusing to tell what the ph is, especially when the nutrient solution is a yellowish brown color to begin with.. I'm wondering if I've been feeding too much Humic Acid and it's built up in the soil..? I've been using the recommended amount but we know how that usually goes 😂 The bottle says you can't use too much but it's literally got acid in the name so surely it could make the soil too acidic..? I'm looking into getting ph test strips.. Does anyone have any experience with these? I'd eventually like to invest in a ph meter but don't have the funds to drop on one right now as they're a bit pricey.. does anyone know of one that's reliable and cheap..? This is my first grow that I've had to worry about PH as I used to use the Ph Perfect line from Advanced Nutrients.. nutrient lockout was likely- but not from Ph.. at least I'd assume as I never tested the ph while using it.. 🙄 Goes to show "easier" is not always better- make mistakes and learn from them.. THAT'S HOW WE GROW Every grow is a learning experience and I've already learned much from this one! But anyway she's still kicking and I hope I can get the ph figured out.. She's really taken to the scrog training and has become quite a bush in just one week! She should be ready for flowering soon, I'm trying to hold off the switch until my other plant in the tent is a bit bigger and can handle flowering.. I don't expect as much for her as she's younger and smaller.. All-Ball on the other hand I'm already having trouble keeping her small even before the stretch! I hope her bud growth matches her veg growth!