I've noticed when you deposit some crypto here, you have to convert it in to BTC before anything else. Is their a way you can just convert it without passing through BTC first. I always seem to be paying half the amount I get in fees.

Basically like this;

NANO>GRLC

or

GRLC>TRON etc instead of

GRLC>BTC>TRON then loosing near enough all of it due to BTC fees