#2 - Good start. TX!. Colors are ok. We allso like the shadow. However, the word "Boost" is getting somewhat lost. The overall impression is somewhat "too" dynamic / noisy. Maybe better to seperate the logo from the name?
Your #5 looks good. Although I also like the italics of the word "Boost" in your # 6. In general, the fonts are still somewhat "heavy" and "glossy". I wouldn't mind this being somewhat more business like. TX for your great efforts.