VTL Deluxe 300 Biasing

On the VTL website is says the following-

Therefore, to get a result of the required 27 – 30 milliamps the voltage reading should be 270 – 300 millivolts for the 10 Ohm resistance readings, and 125 – 150 millivolts for the 5 Ohms resistance measurements. 

However, I found a copy of the VTL Book which was published around the same time the amp was manufactured and it states-

BIAS: Conservatively set at factory for 6550 to approximately 30/35mA, bias current can be increased to double and triple those figures (moving nearer to Class A operation) but to no sonic benefit; and shortening tube life thereby.

Can anyone advise me as to which one I should follow?