I would target getting that front height the same as unhitched. Measuring the height is an estimate for axle weight. This has been plenty sufficient for my TT and two tow vehicles to provide stable towing at higher than legal towing speeds.
Increasing the WD to the front axle varies for the different actual hitches. Many use some kind of chains of which the manufacturers speak in terms of links under tension. Reese for example says always use at least 5 links under tension. Fewer links under tension means more weight transfer to the front axles. Another method for some WDH is to tilt the ball towards the trailer. Higher angle/tilt means more WD.