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OK, so like this?
awk '
NR == FNR {
a[$1,$2,$3] = $4
next
}

FNR==1 {
print
next
}

($5,$6,$7) in a {
if (a[$5,$6,$7]>3){
$22=a[$5,$6,$7]
...

Your requirements are not immediately clear to me. Perhaps this is more what you mean:
awk '
NR == FNR {
a[$1,$2,$3] = $4
next
}

FNR==1 {
print
next
}

{
...

Try something like this:
awk '
NR == FNR {
a[$1,$2,$3] = $4
next
}

($5,$6,$7) in a {
if ($22 == a[$5,$6,$7]){
print
}
next
}

{
$22="Unknown"...