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From:   Junio C Hamano <gitster@pobox.com>
Date:   Wed, 1 Mar 2017 08:06:40 -0800
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Subject: Re: Delta compression not so effective
To:     Marius Storm-Olsen <mstormo@gmail.com>
Cc:     Git Mailing List <git@vger.kernel.org>
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On Wed, Mar 1, 2017 at 5:51 AM, Marius Storm-Olsen <mstormo@gmail.com> wrote:
> ... which brought it down to 206GB in a single pack. I then ran
>     git repack -a -d -F --window=350 --depth=250
> which took it down to 203GB, where I'm at right now.

Just a hunch. s/F/f/ perhaps?  "-F" does not allow Git to recover from poor
delta-base choice the original importer may have made (and if the
original importer
used fast-import, it is known that its choice of the delta-base is suboptimal).