Being a novice in vaping, I think a pro tank is too much for you. It kicks out a lot of vape. Obviously, blowing your socks off and making your throat sore. You are drawing a lot on it to compensate for your loss of the 'real fags'. I find a pro tank is sometimes too much for me and I've been vaping over 3 years. You cannot go wrong while you are still trying it all out, on Riva 510 and a CE04 clearomiser. I still use them all the time, you cant go wrong with them. I use either 100 vg liquid, which gives the vape, or 90/10 if you were on high nicotine fags then go for a 24mg nicotine. It is really trial and error Im afraid, what suits me might not suit you. Go for samples, 5 ml/ 10ml and see how you get on. Persevere my friend, you will find the liquid that suits you!!