Nope, that's the first thing I tryed. What that does is give every hash element a reference to @loop_data_1, whitch means that all the <TMPL_LOOP>'s will use a reference to the same array

$loop_data_3{1} = \@loop_data_1;
$loop_data_3{2} = \@loop_data_1; (same data, not what I need)