That's clearly wrong, the more chakra he puts into the blast, the stronger and farther it can get as look at the range the first one covered
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compared to the second
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And now a smaller one
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Or you can look at the range Chouji and Chouza were from Deva
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basically the same range they were in the scans i posted before when they were NOT hit
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Note that he rushes forward enough so that he is directily horizontal from the Akimichi on the right's attack
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Now they were completely floored by an ST when they were basically at the same range
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also note that Pain was bushed even farther back
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Sorry if all the scans confuse ya

Anyways, all this is kind of pointless as its not like Minato would be at such a great distance anyway's., and as i said before ST is not even needed, just the panda summon