I ran my jig bussiness doing nothing but ladle pouring.
Small jig heads in my bussuiness were 1/64, 1/32, 1/16, and 1/8oz.
One issue with ladle pouring is what I refer to as "bounce" pouring. you start to pour, your hand twitches, and you stop for a brief second and continue. this causes the lead to harden either in the cavity or in the sprue. I always rest the ladle on my mold.
Despite the ease of use of a small ladle, I always had issues with one. I went to the large laddle as it held more material and more importantly, more heat.
The BIGGEST issue I had with pouring small jigs is the lack of clean lead. When pouring large jigs (1/2oz or bigger) this isn't as big of an issue. What I mean by clean lead isn't necessarily whether it is dirty or not but rather what the makeup of it is. For pouring large heads, I prefered 15lbs of 95% plug pure lead with 3lbs of alloy or wheel weight lead. This gave me a very consistant pour, a slightly harder head, and a head that didn't tarnish.
Unfortunately, this material was NOT the best for pouring small jigs. The reason is that the allow takes more heat to stay liquid. One bounce pour and that lead quickly turns hard and doesn't allow the full flow to through your mold.
Although I never used Jacob's molds, I would say they are no different than any other. Obviously you have the mold hot enough. My advice would be to utilize PURE lead as a starting point and crank your pot up as high as it will go. You will get some flashing and garbage on the top as you start to burn the lead but it will stay liquid. Make sure you clean your ladle with a wire brush. Wheel weight lead with be the biggest headache when dealing with tiny jigs. Heck, having the wrong combination will be a headache when dealing with larger jigs as well.
I have OCD "Obsessive Crappie Disorder"