Yes, you do. Try the steps I listed. Now, if you put maximized ordnance on, use the ordnance points, leave the refit screen or switch to a different ship and then go back and try to take maximized ordnance off, it will magically re-appear. But if you take it off before leaving the refit screen or switching ships, it will not.
Now, it's possible that this is due to some other mod messing things up; just in case, here's the list of what I'm running right now.
Starsector+ 2.4+
Console Commands 2.3
Interstellar Imperium 1.6.1
LazyLib 2.0b
Neutrino Corporation 1.80
Omnifactory 1.10b
Save Transfer 1.3
Shadowyards 0.5.2.2
The Knights Templar 0.9.3g
ZZ Shaderlib Beta v1.02