Absolutely love your flower molds - such great detail with the leaves!
The lumpiness was probably from overblending to a thicker trace. With practice, you will be able to spot emulsion and pour sooner.
So-called "glycerin rivers" are most often seen when using lots of water. IIRC, most of Jan's recipes use 38% water as percent of oils. This often results in way more water than is necessary for cold processed soap, and increases the likelihood of glycerin rivers. You can plug her recipes into a
soap calculator and change to 33% lye concentration instead. That is a completely different setting that is more common for today's cold-process soapmakers, and will give you more consistent results as you increase or decrease batch sizes.
Every recipe from every source, even the best ones, really should be plugged into a
soap calculator before you make them. Even the best authors have typos!