M403 is a very tiny PV and if I am not mistaken, automatic only. I use manual M402 and M401 as my regular PV so I know what I am talking about. If you want a ton of TH then you may need to use a larger PV than M4xx.
I was an ultralights and lights smoker and not one to take big hot drags so I wanted a smooth tasteful PV with just enough TH. I got manual batteries to have more control over the drag and so I wouldn't have to drag to warm it up.
Re TH - I find that many fruity juices have little if any. I do get enough TH for me from high PG tobaccos and flavors you would expect to have TH like ginger ale, chai, etc. A small PV doesn't give a huge drag so you have to search for TH. Some tobacco juices are very smooth and won't give much TH. Others will give more.
Ginger Ale - I like Velvet Vapors Raspberry Ginger Ale. Flavors like Ginger and Cinnamon are things you feel when they hit your throat.
Tobacco - I like Backwoods Brew Casablanca, and I like to mix a bit of Backwoods Brew Peach (no TH) into a plain Chinese PG Marlboro-like tobacco, and I am looking for more tobaccos. I found RY4 has TH but I don't care for the caramel flavor of it. 555 - I like it but it has little TH for me.
I always get at least 70%PG (i.e. 70/30, 80/20)
I've heard the Death Juice described here has a ton of TH
http://www.e-cigarette-forum.com/fo...1387-happy-smokes-death-juice-alpha-18mg.html
If you cannot tolerate PG then you need to find hard-hitting VG juices. I've heard the Boba's Bounty here has a lot of TH for VG.
http://www.avejuice.com/