So I made my own scart splitter cable and here's what I'm trying to do:

GOAL: I want to be able to record my gameplay and play on my CRT TV (Bang Olufsen MX4000) at the same time.
PROBLEM: Because I'm using two units to feed the RGB signal from the video game console, the picture on my CRT TV goes dark, not completely black but it's like you turn down the brightness down a little bit. Turning the brightness up to compensate will make it over exposed.
I have the correct cables for my consoles (PAL) (SNES, SEGA) which I'm testing on right now, they are PAL cables. Works great!
SETUP: The green in the picture is the homemade scart splitter cable. One female SCART to two male SCART-connectors. I just piggybacked the two male cables into the female connector. The upscaler I'm using is this cheap RGB-to-HDMI scaler which I'm only using for capturing and I'm aware that it's not the best out there, but it works for me.
The Elgato Game Capture is my capture device and goes to the PC.
QUESTION: How can I amplify my RGB-signals going to the TV and avoid getting darker picture AND doing it without ex. a big and clunky SCART 1-4 output unit?
I would really appreciate your help!
Thank you!