You should enjoy the Peterson Flake, esp. since you don't like Lat anymore. I've had that one from early on; one that I interspersed with my Latakia blends to vary it up a bit and hopefully prevent palate fatigue.
So far, the Orcilla Mixture is the only Robert Lewis tobacco I've tried. It fills a specific niche in my rotation. I expect I'll get round to trying Tree Mixture at some point.I like that Orcilla Mixture, very light and easy. Have you tried Tree Mixture? I am finishing up one that I thoroughly enjoyed having for the first time.
That Burley London blend is good stuff.