Why do you like to trade short position? Why not go to long trading? Keep in mind that the price of promising coins will always go up from the long term. If we take the long trades, we make a loss, just leave there and still have a chance to make a profit when the price is increasing in the future. But for the short, it is more risky. I would recommend that taking short trades is better for a day or two!
Well for one thing long positions are more interest heavy than short positions as you know. It's pretty cheap to keep a short position open for a long time.
If you want to go long position, you would better go without leverage. So you don't have the burden of paying interest, just believe the potential of that chosen coins and hold for a chunk of profit.