I've put an A5 bar magnet on the bottom of the pickup - bit late to test it now, but will report back with findings tomorrow.
Well, just put the Tele through some riffage with the Jet City JCA100HDM and there is certainly plenty of grunt in the bass and the top end has been rounded out - easy enough to add a bit more top end from the amp.
Been playing doomy riffs for the past half hour, so its all good - doom on a Tele eh, who'da thunk it.
For most applications, its probably too bassy so I'm not sure if a weaker magnet would be just the ticket or even something which makes the pickup slightly brighter (I've used an A5 bar, so maybe ceramic would be the ticket). Taking off the bottom plate and leaving the extra magnet on may be the best compromise.