Below is a quick guide & a full collector guide for leeching. The most important things are:
1. You're blocking on time before the defender arrives at logs at 24s on waves 6+
2. That you're collecting around the ranger spawn whilst the attacker is speccing. You should be shift click deleting eggs and continuing to collect any time the client is healer or collector for torso/skirt runs, during all roles for level 5 roles, and for all hats, gloves and boots. The only time you should be loading cannon is during torso/skirt runs when the client is defender or attacker, or during hard diary - queen kills.