Yes, if half the water is running through you can back off the watering for a day or two - not that it does any harm, it's just a waste
We are going to top this plant soon, so updated pics of the top of the stem would be handy so we can time it just right
Counting from the bottom, you want 3-4 pairs of shoots where the leaf stalk meets the stem
Then you need the tip to grow just enough so you can cleanly nip it out, leaving the two shoots immediately below intact
When you upload pics, I'll try to mark your pic showing you exactly where to cut
It's about 3 weeks old now and you want to top it before it starts to show pre-flowers