Why go about even trying. These type of tracking platforms aren't designed for long exposure astropics. They're designed for wide field pics of sub lengths up to a minute or two in length at FL's of around 18-200mm. If you want better peformance, then you should be prepared to pay more money for a more robust and better tracker, such as an
astrotrac or
starlapse. Better yet, buy an inexpensive EQ mount with dual axis motor drive like the little iOptron SmartEQ Pro, EQ3 or something similar.