Thanks @muth that’s a great tip, I know exactly what you mean about the break in period. I’ll give rayon a pop. I’ve got myself a single coil set up now haven’t settled on the right coils for it yet got a kanthal Clapton coil in there but they spit and pop a bit so been trying different wattage etc to find the sweet spot… if there is one lol!
And a massive thanks to everyone for their help and advice it’s much appreciated 
I like to keep things simple. I mix all single flavors at 4% at 20/80 PG/VG no Nic (my usual mixing ratio is 6 -14% flavor, 3mg nicotine and the balance in PG). If it’s a worthwhile flavor but too strong or too weak I will try out different percentages, otherwise it gets relegated to gather dust (with so many others lol).
I use a single coil rda with fresh wick each time. The quickest way for me is not tuck the wicks, just leave a little bit either side of the coil - it uses less cotton, no messing round try to tuck into juice wells - and it’s easier to pull out.