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1.5553 - 1.5552 # 1 point
1.5553 - 1.55   # 53 points (your sub will fail with this)
1.56   - 1.55   # 1 point? 100 points? (insoluble from data alone)

sub points {
    my ($was,$is,$exp) = @_;
...
(2) 1.55 => 1.56        +1
(4) 1.55 => 1.56        +100
(4) 0.9984 => 0.998        -4