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The YHRD is a very useful tool for analysing Y-STR haplotypes from under-sampled regions of the world, such as our own (Iran-Afghanistan-Tajikistan-Pakistan).
As mutations can take place on any STR locus per generation, using only 9 loci to ascertain paternal line relationships going back more than a few generations is accompanied by a very high margin of error ("red herring" matches between haplotypes, difficulty predicting Y-Chromosome haplogroups etc.)
From experience, 9 STR's along the Y-Chromosome are simply too few to make any meaningful conclusions from data, particularly if it's being used in the context of prehistoric migrations.
As a genetic genealogy enthusiast, I currently consider 17 STR's to be the minimum "threshold" based on experience. Recent studies (>2009) generally seem to test at around the same level.
However, in this particular case (R1a1a, South-Central Asia and Europe), your results are in line with other people's findings (including my own). Certain "types" of R1a1a (the K supercluster in particular as per Polish R1a1a Project nomenclature) have matches from Europe all the way into Central Asia and date back to roughly 4000ybp.
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