...which is 76 knots (it's a boat) - no wonder it's not working!
How are they paired? Is it the low res. ones together & vice versa, or a low & a high per coil? My train of thought here is that if they are matched in resistance then you'll get equal spark on both plugs of a pair, if one of each, the lower res. lead will take more of the charge as it;s an easier path, and mean the high res. one is starved of charge...... Are your leads of a length you could swap them so the two high & the two low re. leads are hanging off the same coil?
Screw in leads sounds like a high tech version of mine. (i can replace the lead & leave the coil in place) I could be cynical and say it's on a similar theme to the Clamshell flywheel removal thread - really obscure old American thread so you can't just go out & buy a bog standard puller......
How did you check the leads - what seems OK at low voltage DC (i.e what your multimeter uses to calculate the resistance) becomes a whole different kettle of fish when you start to throw high voltage high requency AC at it. As an example when I checked the insulation resistance of my old spark plugs on the Yam were "open circuit" (i.e nothing wrong) when I prodded them with the multimeter. Then borrowed a Megger - at 1000v DC, one of them had about 150ohms insul. res. (i.e gubbed) One new set of plugs later & it was like a new engine. The same could be happening with your leads.