If the recipe of 16 oz of each (OO, CO, Palm) and 2 oz of Castor with 16.5 oz water and 7.3 oz lye set up too quickly for you to do what you wanted to do it could be due to various things. You could try using the default setting of 38% water as percent of oils instead of using the 33%. I put the numbers side-by-side and you'll see that there was 2.5 oz less of water in what you went by; less water is ONE of the factors that causes less time to work blending colors and FO and with working with your design. I'm assuming this recipe is what set up quicker than you wished.
Total oil weight 50 oz
Water as percent of oil weight 38.00 %
Super Fat/Discount 4 %
Lye Concentration 27.815 %
Water : Lye Ratio 2.5952:1
Water 19.00
Lye -
NaOH 7.32
Total oil weight 50 oz
Water as percent of oil weight 33.00 %
Super Fat/Discount 4 %
Lye Concentration 30.734 %
Water : Lye Ratio 2.2537:1
Water 16.50
Lye -
NaOH 7.32 (it didn't work formatted side-by-side so I had to move the info to one under the other)
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I know many are giving good advice and pointers in how they are able to keep things fluid enough to do what they wish (blending colors & FO, and accomplishing their design choice). I just thought I'd mention water.
I've used the same recipe for more than one aim and found I use more water if it's going to be something that's gunna take like 20 minutes or so. If I intend to just use one color or two and do a simple pot swirl then I can get away with less water. Up until recently I usually always used less than 38%. Now that I'm wanting to attempt some techniques that require a lot of time I'm using more water and soaping cooler than I have in the 3 years I've been making soap. And I use the SB only very briefly, if at all.