Gotcha, sounds like you are doing all the right stuff.
I found I had plenty of energy in the weight room when I was hitting it earlier in the year while low carbing it.
Where I really struggled initially on the LCHF deal was with going fast on the bike for over an hour. That has since returned as my body got used to burning fat and creating glycogen more effectively.
When my GF started, she found that having a big carb day resulted in digestive issues as well. I never had that during my induction into the whole fat-adapted process.
Coupling low carb with intermittent fasting seems work well. Prior to going on vacation, I was eating 8 hours on and 16 hours off, while doing 3-4 meals a day. They say it really kicks in when you can tighten it down to two (~1000 calorie) meals a day in a 4 hour window. I haven't gotten to that level of fasting yet, but that's my next goal.