Tony,
it's hard to tell in the photos, but I think I see the filter in the form of brush strokes? Especially in the upper left hand corner of the back? Do I also see the filter color pooled up around the rivets/bolt heads?
If this is the case, you're putting on too much, or too thickly. The trick to filters is taking almost all of it off at the same time you are applying it. You want to just wet the surface, if it's pooling around the raised details, wipe the brush on some paper towel and then wick the pools away with the clean brush. You only want to see a slight, wet sheen to the surface, you don't want to see any color as you are putting it on. When it pools up around raised details it becomes a wash, which is used to make the raised details 'pop', a filter is meant to subtly shift the color of the vehicle, or tone down the sharp contrast between different camo colors.
The color shift should be very, very subtle, almost invisible to the naked eye after one or two applications. All of AK's products are good right out of the bottle with no need to thin... I'm not saying you can't thin them, as it comes down to personal preference but if after only two applications of heavily thinned filter (50/50) it is covering your paint... then you are applying it far too heavy.
What you need to do now, is take a clean brush, dip it in clean spirits and start to remove it, make sure you continue to wipe the brush on a towel to wick the filter out of the bristles, and re dip in the spirits. You should be able to continue this until you are back to the original surface color if this is something you've only just started doing. Don't saturate the surface with the spirit, but make sure you keep cleaning the bristles otherwise you will just continue to move the color around the surface and not remove any of it.
If this doesn't make sense, or you have any questions call me, I'm up for about another hour or so.
K~