I think something finally "flashed" in my head late last night, after reading up on Speedlights.net that would kind of make sense as to why my shots are coming across with such flat / even ! And feeling a little silly if I am right!
Basically I am using 2 flash units in brolly's, if those 2 flash units have different guide numbers (for example I have been using my Metz 48 (GN 29) at 1/8 or even 1/4 as my key , and a Yonghuno 560 (GN 39) at say 1/64 or even 1/128) That would more or less give even wouldn't it? (I've guessed an example setting - so please bear that in mind - and I am only very new to this!)
I really SHOULD be using my YN560 as my main and the Metz as my fill shouldn't I??? I've tried many combinations of power settings, and without pumping out 1/2 or 1/1 through the metz I'm not having much luck creating the fill effect. Which sucks the power pretty quickly!
I will try it tonight, but is my thinking more on track if I swap the flash used for fill to the key? Of course then I would have to adapt the power settings of each flash gun....
Oh I hope this makes sense, because I am a little lost now lol... So much so that I'm waiting on studio strobes to arrive thinking I would be able to learn to better with those! It won't be a waste, they will get used, but I could have saved some cash!