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#!/usr/bin/awk

BEGIN {
   col3[""]=0;
   col4[""]=0;
}

{
   if(col3[$3] <= 0){
       col3[$3] = 1;
       data3 = $3;
   }
   else {
      col3[$3]++;
      data3 = ($3-0.1*(col3[$3]-1)); 
   }

   if(col4[$4] <= 0) {
      col4[$4] = 1;
      data4 = $4;
   }
   else {
      col4[$4]++;
      data4 = ($4-0.1*(col4[$4]-1));
   }

   print $1 $2 data3 data4;

}

nawk 'a[$3$4]++ { $3 -= 0.1}1' test

awk '($3 -= 0.1 * c[$3,$4]++)||1' infile

awk '($3 -= 0.1 && c[$3,$4]++)||1' infile