2-3mΩ is pretty much standard for most packs I have tested when new, the higher the C rating the lower the initial mΩ with some cells as low as 1mΩ... most of my packs tend to lose performance around 6 months to a year and I'm measuring 8mΩ+ at that point which I swap out that pack from a "race" to "practice/qualifier" pack... typically pack swelling starts to occur around 15mΩ+ and that's about the time I retire the pack for good.

For 4S use in 1/8 buggy, I don't think it's necessary to cycle those packs, some brands of batteries do tend to last longer than others. I would encourage you to give Trinity White Carbon a try when the time comes to replace your current packs.

Also be sure to check the IR of your connector too, that will increase your IR readings significantly if you are not using a high quality charge lead.