Without knowing what your stabilizer level is, it's hard to say what should be happening. If your CYA=400 . . . then, no, 35 ppm won't be enough. That's why we want a CYA test. Did you check to see if a HTH 6-way was available in your area?

I'm reluctant to tell you to go higher, lest your have LOW CYA, and bleach your liner. By the way, with OTO, 35 ppm is dark orange, without any dilution.

One quick check: are you using DISTILLED water to dilute? Most tap water has chlorine, more than enough to cause testing error, if you are diluting.