Hey Steve!
Don't be so hard on yourself!
You're trying a new method and IMHO it came out good!
If you're not completely satisfied with it, that's another issue.. And I'll help you making you happy about it!
Ok, so lets try another tech used a lot by armour guys:
Aply the decals using your favorite method 

 seal them and let the varnish dry. You'll have to let it dry properly (I'll say a week, if it's on a 20ºC environmental, no moisture or damp) Even if it is acrilic (Future floor polish) make sure its REALLY DRYED!!!
Then using aritists oils (burnt sienna, titanium white, yellow ochre and lamp black) make small dots, using a toothpick. Spread them i a random way, but make kind of colour hues groups (for instance, near the vents white and yellow ochre with a point of burnt sienna, near the "waterline" where the red starts a genereous (compared with the rest) amount of white dots)... and so on!
Then, using turpentine on a damp flat brush (size 3 or 4) start smearing all those dots and the hull will start to have same very subtle shades of black/grey.
Smear all of them until no dots are visible, but several shades and hues are visible!
Put aside and let it dry (another week or so)
I don't know if this will satisfy your needs, Steve!
Let me know what you think 

Skipper
EDIT: And as usual I forgot something!
After this smearing and hueing of colours you can seal the Kilo and after give a wash on the recessed panel lines 
