Molecule C - AKA TAC - Its a very useful social/secondary. Actually, the best way to test it is blind, without reference to other peoples findings. That way you give the best quality info, be it good or bad. Start with it as a standalone at a range of doses and then progress to using it in combo with say TUTH.
Yes, generally it does help matters to spread you application about a bit - presents a larger surface area to diffusion. However, you don’t need to keep all your apps to different points - It is fine to layer sprays together. Just leave a minute or so for the solvent in each layer to dry down. After that, a cover scent can be sprayed if needed. The only exception is for oil-base pheros, which do need to be kept apart from sprays as spraying over oil can mess-up diffusion.
Some pheros also suit different app points better than others - think how an interpersonal interaction builds. Personally, I tend to work with most of any Androstenone or Androsterone application towards the centre - neck/throat/upper chest ares, with only a smaller part of it spread out to the periphery - wrists/forearms but where socials are concerned, I tend to work the other way, with most of the app on the periphery and only a small part on the centre with the sexuals.