5.9 Ohms show a couple things:I ohmed it out at work. 5.9. What does that tell me? My furnace heater is intact? Readin up on reclaimin.
My first guess was wrong and it is likely both your heaters are intact. I'd stick with the second one now - The wick is shot.
Also 5.9, I've not seen over 5.2 (carts seem to be +/- .2 Ohms, but the same in each box/batch), so either the meter's zero point was off or you had problems holding the probe to the curved surface or ("best" guess) you have some oil buildup on the center post. None of these matter (unless the buildup gets thick enough to clog the air vents) - In that range the heaters are fine.
You seem to be doing the right stuff - reclaim and move on. Good luck - It gets easier.
BTW. I don't know if everyone notices this, but I often hear a "sizzling" sound when the wick starts to go dry. Usually weighing the cart (as others have noted - it is important to know the starting empty weight) gives a good clue. I use .3g as a line (OF says about .2). If there is less than that, I add more - If there is already more, I figure the cart is dead or dying. The sound is quite obvious, at least for me, but I probably used a V1 for many months before I realized it. Also after the sound starts, cooling longer will make it last a bit longer by giving the wick more time to flow (already warm) concentrate through a restricted, but hopefully not entirely yet clogged path and still saturate well enough for the next hit.
-NDA