Music Podcasts: Getting levels equal for various music (vinyl, digital, mono & stereo)

Good morning,

I'm doing a music podcast that uses old 7" singles in which some have the 60s wide seperation stereo, standard stereo, and mono tracks, as well as digital music.

The probel I have, is levels. I use the match level option to -14LUFS, but I still get sme files quieter, and some louder, depending of the age of the track.

If I was playing out live, I would be using a mixer, and control gain, but for this podcast I do on my laptop.

On the mix channel, I have FabFilter Pro-Q to kill some of the muddier low end, and I use Izone Maximizer for limiting. With the limiter, I could push it so all tracks trigger the limiter, but then some will be too compressed.

Does anyone have any suggestions to get a more even level, for a better listening experience?