I love how you ask about sints and your song in signature sounds amazing, and as soon as sint goes, I'm like...this man is on the right quest.
Yea your sint in this song seems low quality. Volume seems right, i guess your real quest should be how to get open edm sint, compresion/eq tutorial.
Youtube it dude.
Sorry if it's a shit post because I never produce this kind of music, I'm rather soul house producer (piano, organs, strings, rhodes, bass ......) but what I do i just go by the feel.
Maybe you're just digging to much (even reading vsti manuals) rather then just go simple youtube tutorial about it and after that just go by the feel.
I had a problem with vocals, main mastering of a track ,youtube helped me so f much. Many people sharing their tutorials there.