I think you're pretty fine, remember that 100-150 words is only a small paragraph. You're fretting this much about adding half a page for a pocket-sized edition. 1500 words is by no means a long chapter and if your writing is good and you're cutting at the best times for the narrative, people won't notice.
Remember as well that this cutting up is almost exclusively to allow you to post multiple times per week for contemporary readers, most of your readership will be in a position to binge at least a portion of your work, and they'll be reading possibly tens of thousands of words in one sitting.