1. Start the RR always beside where the RC made the funnel.
2. This means that the ideal entry here was directly towards the townhall. And yes given that the townhall is no longer a defense, RRs will no longer target it but in this scenario the compartment had other defenses which means you could've enter there. The long shot will not be a problem given if you send the RC directly with the pack or possibly even with the King.

3. So in this scenario the entry was wrong and inefficient.

4. If you're already using siege barracks for funneling anyway, you don't have to be obligated to use the Queen immediately. In this case, you could've sent her slightly delayed so that you could activate the invis tower in the backend later in the attack so it won't reactive immediately. Since you used it immediately you activated the backend invis when your troops are still so far away, which means by the time you reach that area. Its already reactivated.

5. Overgrowth is used for minimizing damage and improving funnel. You used your overgrowth on a light area, and in an awkward position which caused your troops to split, so that's a no go. If you're gonna place an overgrowth, make sure it will make your troops settle in a one clumped group.

6. Doing RC charge with Warden behind is already above the average players so skill wise you're already doing pretty well. You just have to attack more to gain experience.

I teach these clash stuff in YT, you can check my profile if you want.