From what others have said about the Venom 3 its a great powercord but I wouldn't hesitate to move up Shunyata's line when budget allows of course. If it competes with units $3000 and up, treat it like a $3000 unit! My intial powerord was Ps Audio's AC3(12awg) which list for around $150, I now us a $699 AC10(10awg) and the improvement is not small in terms of refinement and tonality and don't worry about price, the best cord is the best cord period regardless of cost. As for rake, this is leaning the speaker forward, backwards or perfectly leveled to further time aligning of the presentation, this is assuming of course your speakers have out riggers or spikes. As for the rule of 1/3's, I use it myself for speaker placement its fantastic, it can be a pain to adjust them for best sound , as my speakers are 6ft tall (120 lbs) and have 6 spikes per base! I know what you mean by large speakers .On another when budget allows try some new Ic's, this could really take things to the next level.
Any acoustic treatments?
Any acoustic treatments?