hello!
i do not have too much experience using the same tokens on multiple arduinos…
but wouldn’t be more logic to have 4 separate devices in the blynk app, and use different tokens? since the latest major update you can control multiple devices from the same project…
also, you should look into what
#define BLYNK_NO_INFO // Skip device info
is doing, because @vshymanskyy said several months ago:
you can use the led widget for this, or display widget for every button and send “on” or “off” text from hardware to display widget.