It's stupid. These LEAD sieges should not even decay, it's just a dumb annoyance...not even a time sink. I always get the leads again before I use them up anyway. It takes about 10 minutes to get more.
What I don't understand about Timbercrow is why the back flap is smaller? To show off... granny panties? Really? If the back flap was the same size/width as the front flap it would look better and eliminate the ugly.
Light attakcs and weaving is a huge portion of your dps, so yeah, the dps loss of a 0,5 LA/s score is significant compared to, say, 0,95 LA/s. Lag certainly doesn't help, but I would assume that you are going too fast with your spammable. It takes a while to get used to the 1s rhythm.
Since you are playing on XBox and don't have access to add ons, try using a metronome on your phone and set it to a 1s click. Then start with sequences of just 10 or 20 LA/spammable and repeat until you got the hang of it.
Hitting 40k and even upwards of 50k on the 3 mil dummy on console is entirely achievable, and it comes down to proper cp placement, proper weaving, and a good rotation more than anything else. Gear is secondary to all of that. I myself am at 47k on the 3 mil with my sorc with off meta gear, no bloodthirsty, no minor force, no psijic, no mages guild, and a twilight matriarch over tormentor, on xbox console (I was testing out builds that would be practical for me as well as fun). It comes down to dedication to learning your class, and patience.
Not everything is about tournament and elite small scale which has its place and can be controlled by tournament entry rules.
Remember some also like to have fun and not be so serious.