Are the comps you use fast enough to catch those peaks? I almost always end up having to resort to brickwall limiters if I need to "louden" mixes that are already peaking near FS.
The way I set them up, they almost do limiting, and sometimes I do have to use a limiter. the Focusrite D3 has a Limiter in it, I just set it so it grabs only the worst peaks.
Cheers