Wind Generator Charging Via Diode Splitter

[nigel1]

Have a D400 which can charge both house and engine battery banks via a diode splitter.

The D400 output is controlled by a 6TB regulator.

My basic knowledge of electrics tells me that there is a about a 0.7 volt drop across a diode. The regulator is factory set to output 14 to 14.2 volts, but is adjustable to allow charging of different battery types.
My question is can I increase the voltage output from the regulator to say 14.8 volts, to compensate for the voltage drop across the diode splitter, or, am I violating some fundamental principal of battery charging by considering this