From my experience Deluge never breaks the limits, unless told to with a local peer.
The client I have seen has been one peer, someone on two different Sky Broadband IPs in the UK, using a client showing in Deluge as libtorrent_leap/1.1.1.0. Looking into it this is perhaps Vuze leap, a cut-down version of Vuze. Either the official Vuze leap is somehow tricking Deluge, or this person has hacked Vuze-leap and is exploiting Deluge?
Attached is a screenshot, but it is not good. I took the screenshot after getting rid of the leech with
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root@torrent:~$ iptables -A INPUT --source 176.26.211.nnn -j DROP
I'm not trying to file this as a bug report, just as a WTF and hopefully as a heads-up if the WTF has any merit. I dunno if anyone has the infrastructure (to use an overkill word) to give Vuze-leap a try with Deluge?
FWIW Deluge is the one from Debian Jessie, 1.3.10. Plugins enabled are AutoAdd, DefaultTrackers, Execute, ltConfig, Pieces and Stats.