Forget about the soup (slump), the water/cement ratio is the single most important aspect of achieving compressive strength, so whatever design mix you are using, be it a bag mix or mixing from scratch, adhere to the correct amount of water, and cementitious material (portland), keep it the same (uniform) for every batch.
If you water down concrete until no slump,(soupy) it will decrease the compressive strength.
Say for example, you are pumping concrete, the slump ( if you take concrete and put into a testing form, of say a certain height like 10", remove form and say the pump mix design calls for a 4" slump, so it can flow, when you remove that form, you measure the sag or how much it settles from what it was in the form) The mix design may call for a lower slump (more soupy)but still attain the desired compressive strength, by mix design; water/cement ratio, as well as all the composite aggregate sizes, amounts etc. Pump mix for example would be one with a lower slump, and sometimes a particular job, a contractor may want a lower slump, but still need to attain a certain strength.
I used to review design mixes submitted by contractors for NYS OGS jobs, and the structural engineer whom I worked with awlays had me calculate and or check the water cement ratio, and approve or approve as noted when corrections to that were needed to maintain what they call for in their specifications, from his experience on their jobs, hundreds of millions in work over the years, the W/C ratio was very important, I never forgot that, though I may have forgotten the calculation LOL !!!
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