That's getting into mod territory. I don't believe you can't just open up a single file in a text editor and change the neural link DP limits. There are a number of mods which do change numbers like this, and I'd recommend taking a look at how those are done, or asking in the modding part of the forums how one would go about a simple skill override mod.
The functions you'd need to look into are referenced in the neural_link.skill file:
{"type":"DESCRIPTION", "script":"com.fs.starfarer.api.impl.campaign.skills.NeuralLink$Level0"},
{"type":"CHARACTER_STATS", "script":"com.fs.starfarer.api.impl.campaign.skills.NeuralLink$Level1"},
Those in turn point to the NeuralLinkScript class (in the starfarer.api.jar), found under com.fs.starfarer.api.impl.campaign.skills.NeuralLinkScript, which has a:
public static float INSTANT_TRANSFER_DP = 50.0f
That's the variable you'd need to override with your mod to change it.
