Stephen Phinney, who's researched the effects of ketogenic diets on athletic performance, says this:
"There are to date no studies that carefully examine the optimum length of this keto-adapataion period, but it is clearly longer than one week and likely well advanced within 3–4 weeks. The process does not appear to happen any faster in highly trained athletes than in overweight or untrained individuals. This adaptation process also appears to require consistent adherence to carbohydrate restriction, as people who intermittently consume carbohydrates while attempting a ketogenic diet report subjectively reduced exercise tolerance."
And Dr. Mike Eades quotes Arctic explorer Schwatka here:
"When first thrown wholly upon a diet of reindeer meat, it seems inadequate to properly nourish the system and there is an apparent weakness and inability to perform severe exertive, fatiguing journeys. But this soon passes away in the course of two or three weeks."
It seems that many people report this kind of weakness and fatigue, and from reading Phinney, it sounds like the best antidote is to throw yourself into it whole hog (awful pun intended), with no carby re-feeds or anything like that. If your goal is significant fat loss, then I'd say it's totally worth it. There are a few people who don't lose weight even on ZC, but there are many more who do, and quickly, too.
On the other hand, from your stats, it doesn't look like you've got a lot to lose, unless you're built very slightly. If you're losing steadily the way you're eating now, then maybe the switch to deep ketosis won't be worth it to you.
(Personally, I didn't have any of these keto-adaptation issues when I went VLC or even ZC, but then, no one would mistake me for an athlete, either.)
ETA: And if you do go zero carb, make sure you eat plenty of fat. That seems to speed the process along nicely.