I've had MGUS for 8 years and my early K/L ratios were similar to yours, not far from baseline. They started ramping up about 3 years ago and my Kappa is now about 300 and Kappa/Lambda ~28. They still go up and down a bit, but my oncologist told me that I'm fine until my Kappa is in the thousands (hopefully that is the scientist and not the mother hen speaking). I had a baseline BMB 8 years ago and my deranged plasma cells were ~5%; the BMB last summer had 15%, which technically is SMM level, but plasma cells are sticky and clump together, and I have no symptoms from MGUS, so he still has me at MGUS. Even at my level, the chance of it morphing to MM is still low.