Agree that L,L,L as it stands may not be the best target either. I use the Mortgages and Home Buying forum a lot, and find the separation between it and L,L,L a good split.
I have thought for some time that a similar split would work well on the investment property side, and maybe that can be done by leaving the existing L,L,L alone, and creating a new forum for L,L,L with an investment slant.
I can certainly see how it is difficult to get the splits right, but in fairness I think you've done it quite well.