That makes sense. When a new tube is first powered up it changes fast and big, you can watch the bias change drastically in real time on the meter for the first few minutes. Adjusting once a day is wise for the first week to prevent a runaway. You will need to adjust bias on them frequently in the beginning, then tapering off until they are stable. With New Sensor tubes this is pretty quick. As long as they are within 10% of mfg bias spec they are safe, in your case, within 50mV of spec. You are probably already up to the point of checking once a week. If two weeks require no adjustment, then switch to once a month or two, depending on usage. When they start to change again, plan for a new set within 6-12 months, depending on usage. Does your Jolida bias individual tubes or by pair or quad?