The Siphoning Rune is a long-running spell with the rune as its result
The siphoning rune is a spell of witches, designed to multiply her orgone reserves temporarily through the use of a male donor. Given that by the question males have a capacity within two orders of magnitude higher than women with some approaching three, this potentially allows for a high multiplier effect if the plot allows it.
This rune spell, when activated, uses a portion of her own orgone, and channels it through the rune to draw out a multiple of that amount from the donor the rune is attached to. Based on what you are aiming for, this could be any reasonable number. Conversely, it could be that multiple subtle variants of this runic spell exist for different multipliers.
It was originally designed to not interfere with a witch's spellcasting, and in fact was designed to work with the more orgone intensive spells in their arsenal specifically because one witch alone could not power them. That typed, the rune has two critical features that were part of its design to prevent certain misuses.
Firstly, it is a multiplicative effect. This means that a witch that can input more orgone into the rune can extract more orgone as a result. The highest multiplier that the rune can achieve was found to be the limit of what a witch could control.
The second is that only orgone from the rune's creator (a witch) can activate the rune, preventing exponential draw through multiple donors or another witch activating the runes to drain the batteries.
Another restriction is that because this is a long-running spell, a single "unit" of orgone is always drawn from a witch to feed the donor rune, meaning that a weak witch, in addition to not being able to pull as much from a single donor as a powerful one, may only be able to connect to a certain number before problems start to arise.
To give an example: We have a witch -- let's call her Hazel. Witch Hazel uses a siphon rune on her donor, puts in 3 units of orgone and the donor gives out 30. Had she put in more, she would have gotten more. Now how much of that 30 units she can use is a different matter -- the ability to use another's orgone for their purposes.
Power as Status
Social power is just as much of a thing as magical power. While a weak female is still going to be socially ranked above a gifted male, a gifted female will be ranked higher than both of them. In this case, social power is granted to those that can demonstrate great personal power. In the case of the Witch Caste, this is directly related to magical potential.
While this does not address the issue directly as a witch can compensate for a lack of personal power with magic donors, a woman of higher status may have access to more or better donors. The strongest witch may not be the one with the largest pool of donors to choose from, but the one that travels alone or with a single donor, confident in her own power enough to not require multiple people to prop her up.
Naturally, there is a resource crunch in everything -- in this case it is the magic donors themselves. There are only a certain number of male drow around, and as such a certain amount of living magic batteries. If you want to keep it a resource management issue, then consider some of the limitations of the males, such as their recharge rate and capacity.
As a side note, if males and females have the same recharge rate, then it will take males longer to fully recharge due to their much higher capacity.