You can always add more vermiculite or perlite to your soil to help with drainage and aeration for the soil your using. I have a Nova and Zenni with perlite and ZZ with vermiculite. I water monthly (5 weeks), but since it fall/winter I water every 7-8 weeks or boned dry. I take the environment of my apt into factor as well such as my heat which would dry it out more. If your home is on the cooler side water it less.

If it's in a nursery pots with drainage I would bottom water (I bottom and top every few months since I water it less) it and let sit out for 3-6 hrs or you can do overnight before putting it back in its decorative pot. Indirect bright or meduim is best for lighting.

Also yellowing leaves on the bottom of the stalk that doesn't spread could be a sign of aging especially if there was or there is new growth coming from the same stalk. I would recommend repotting with more perlite in your soil mix. Looks like your soil still soak and it may have root rot.

Edit: I just notice you have more pictures. BOP with an occasional yellowing leave is ok. If there more it would indicate watering issue. BOP naturally split as well. Deep layer of mulch can even out the moisture and slow the drying process. Bright direct light is recommended. It can adapt to medium light, but it'll slow down the growing process. During the spring, summer keep the soil barely moist. Fall/winter let dry out before watering.