I don't find that map helpful, it's too twitchy. You need to predict where people are going and those jumpy bots don't have human predictability. They're too
hard to hit.
As for my training method, download the map "billiards" from FPS banana
and load it on your own server (from menu, select create server and pick the map.) You must enable the console (place to enter commands) by opening your options, going to the keyboard tab, click advanced, and check the box that says "Enable Developer Console." After that, apply the settings and press the tilde (~) key, right above tab. That gives you a window into which you enter your commands. After joining blue team, type the following:
bot -team red (repeat this about eleven or twelve times. Press the up arrow key to quickly enter the last command.)
This will give you a selection of enemies in different classes to snipe against. Drop down to the table level and clear the billiard balls. Move around a bunch and the bots follow opposite you. You now have a wide space to practice in. I think it's fun.