Stop adding ammonia. Adding it daily will push the nitrite up so high it'll inhibit the nitrite eaters and stall the cycle.
If you read the method written up on here, you only add ammonia sparingly until nitrite drops below 1.0. You are at the stage where you test every 2 days and if you get zero ammonia after the first second-day test, then zero again 2 days later, add enough ammonia to give 1ppm. You carry on like this, testing every 2 days and only adding 1 ppm ammonia every 4th day until nitrite drops below 1.0 ppm.
If you've been adding ammonia every day your nitrite could be sky high. 15 ppm is where it inhibits the nitrite eaters.
I would do a dilution test. It won't be terribly accurate because that needs pure water and very accurate measuring equipment, but it will give you an indication. Mix 1 part tank water with 9 parts tap water ( a 1 in 10 dilution) and test that for nitrite. If the reading is below 5, multiply it by 10 to see what your nitrite level really is. If it works out at over 15 ppm, do a big water change to get the tank nitrite down to somewhere on the scale, add 3 ppm ammonia and go from there, adding just 1 ppm ammonia every 4th day till the nitrite reading drops. If the dilution test is also off the sclae (ie over 5) that means your tank nitrite is over 50 ppm!
If by any chance the dilution test gives a reading at 1 or below (ie undiluted 10 or below) you won't need to do a water change, but still add 1 ppm ammonia every 4th day until the nitrite reading from the tank is below 1.0.
I also notice that your pH is low. This will also slow down the rate at which the bacteria multiply - they like it in the high 7s. How do you feel about removing the wood until the cycle has finished?