Agility is like life, there's always another obstacle.
You might not see off-side weaves until Open or Advanced, but once at the highest levels you'll see it very frequently. Train for it now and reap rewards later. Train entries from every direction and from every obstacle. 4th - Don't let the start line or position of the first jump dictate where and how you place your dog. When it's prudent, start your dog back of the line enough so that he will be running full speed as he crosses the line and the stopwatch is engaged.