Thoughts on the plug:
Cutting out the underside portion is a great idea, I haven't tried it yet. It will fix the problem of silicon contacting the coils, if that's you're problem
For dry hits, this is what works for me:
1) FLUFF THE WICK
Gently pull up the wicks (gentle, they will disintegrate, and IMO its better to do this with a non sharp object (I use a blunted and sanded down tooth pick, or a straightened paper clip if feeling reckless. See bads video on this) You're doing two things here, one is pulling the wicks UP so they cover the slots entirely. The other is, you're expanding the wick material a bit (this is just my own theory), even fraying it a bit (you don't have to strive to do this, it just happens) which seems to help with wicking
2) Now you need to find a top plug that won't choke the wicks back down. You can use the old middle seal from the fluxo deluxes as its already flat and works perfectly. Alternatively, you can cut out and significantly widen (go to town on this, don't be shy) the wick slots on the new plug (nipple) or the old bottom plug. When you place it back on the cup assembly, watch the wicks to make sure they don't drop back down and get pinched.
2a) Alternatively you can go without a top plug. Yes it will leak if you go over horizontal (right into your mouth), but this works and the flavor is out of this world. A perfect compromise between dripping and a carto when you're at home IMO.
I've also noticed that for some reason, with time, after multiple fills, not only does the flavor improve, plastic undertone go away etc, but also somehow wicking improves and you get less dry hits. The older my Ce2s are, the better they work, even if I haven't entirely reconstructed them. I suspect part of this is due to wick fraying leading to improved wicking. Perhaps the silica wick also expands or relaxes with multiples uses too, I dunno
I vape very high VG (50-100%) so YMMV
I was rocking out with 80% VG on a 2.4 ohm new fluxo with my puck freshly charged (that's about 5.5 volts) last night, only got dry hits after successive long and hard hits where the fluxo was vertical. A quick tip and it went away.