Can\'t help with the RM/musk oil question as I\'ve never used it.
I would always recommend wearing a decent cologne with or without mones. IME women always like a man who smells nice. Go easy on the trigger though. I think smell is probably the least understood sense and it plays a vital role in attraction (between both sexes) and memory.
Contact-18 (never heard of 19!) was made (I think) by GKS Research Technology in Jersey, UK. I have no info about mones content though. I used C-18 when I first started using mones several years ago and in my case I did\'nt notice any reactions.
Everything I\'ve used from this site has been at least slightly effective. I\'ve had the most success with SoE and Andro 4.2. The Edge is pretty good as is Attraction. You can also apply the alcohol based mone products (Andro 4.2, Attraction, The Edge) to your clothes (shirt colar, etc.) where they seem to last quite a while, at least for me.
The Edge and Attraction are available scented the idea being to cover up the A-none smellyness. SoE also has a nice light musky fragrance that seems quite popular.