I really could use your help for me to figure out this mess i'm in, with a concert on the way

So i'm connecting my Strymon bluesky inputs to my apollo twin duo outputs 3/4 and i'm connecting the outputs of the bluesky to my apollo twin inputs 1/2.
In Abelton, in the return track i loaded it with "External audio effect" plugin and setup the outputs and the inputs correctly. now here are my two problems:
1-The reverb is there even if the return A nob on the midi track is volumed to zero, i still have reverb, actually in every instrument i have, now the reverb i can here it no matter if the send A is up or down. That way i can't apply the amount i want for each track i want.
2-There is problem in the gain or the volume, it is somehow very sensitive, there is some sort of feedback or something, i can't get the full out of the pedal, if i raise the decay on the pedal it gets crazy in ableton and same with the gain on the "External audio effect" plugin in the return track, i have to lower both, and that way i can only get a little bit of reverb. Why is that happening? I read online but was not so clear that maybe something called DI Boxes might solve this? but it shouldn't be the case with using one pedal i believe, or what?
Thanks in advance guys,
Best