Hey,
I've read a few of Konstantinos's books. I like them enough. He ocassionally leaves some stuff out, but hey, where would the fun be if all the info was boiled down into one tome? (IMG:
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The LBRP is very powerful, I speak from personal use and practice. I, too, started off with a very formal version (actually from Summoning Spirits, heh). Over time it evolved into a personalized ritual. Not too different from the original but enough so that it "fit" me better. You might just want to stick with it for a few months and see what happens.
As for a dark circle and the LBRP/LBRH, I don't see why you wouldn't be able to adapt them to go together. Especially if Nyx has/has given you a sympol of power to call her. You can pop that in where the pentagram goes, replace elements with the positions of the sun, or lack there of (IE: East, where darkness dies, SOUTH Where shadows are burnt and banshed, WEST, Where darkness rises once more--reborn, NORTH--where Shadows rule and darkness blankets the world). I dont know if the above example is correct for where you live (or where I live for that matter....does the sun travel south? I always thought it did based on the E to W, but I guess it could be North....plus Terran Hemispheres also matter).
Personally I have my own opening rituals that I have painstakingly developed over a few years. They work best for me, though I did try a number of things first (LBRP, Aurum Solis stuff (Spelling?), wicca circles and rituals, dark pagan rites). In the end I found I have darker leanings, but it goes along with my strange view of the cosmos!
Anyway, hope you can eek out something there!
PAX