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Thank you! Yes, I think I'll be happy if I can get "more professional" results given the limitations -- I know it's tough to match (or even approach!) the shots a dedicated studio could offer. But the helpful hints have been great!Front lighting and light placement is causing many issues for you. BTW, you have taken on a subject that is very challenging with less than ideal tools and much to learn to produce professional results, I admire your tenacity as you work through tis subject.
I think you may want to review the exposure triangle to understand how to achieve correct exposure.
Flash sync is limited to a "maximum" shutter speed, in your case it could be 1/250. It is not limited to a minimum shutter speed such as 1/30 which would allow you to shoot at a higher f-stop thus increasing your DoF.
FWIW, I think a web forum has its limits to tutor someone through shooting complicated subjects such as glass drinks. I might suggest you look at online classes which are video based so you get more out of them other than the written word.