I think that universally the best hand position (while sitting) is to have them loosely clasped in front of you. As you're talking, you want to often undo the clasp and move your hands to the rhythm of your speech, somewhat symmetrically.
Though if you weren't tapping your fingers/legs or had your arms crossed, the issue most likely was the eye contact.
Proper eye contact is tricky to learn, I can offer some advice. You can't avoid looking into normie's eyes and you don't want to stare at their face all the time either. Ideally, you want to maintain eye contact about 60-70% of the time. The optimal continuous stare is about 4-5 sec. You take 1-3 sec "breaks" by looking into the distance behind the interviewer, looking at your hands or by raising your eyes as if you were thinking about how to answer (even if you don't need to do it). You also take a break if the interviewer does it (they can feel the gaze even if they're not focusing on your face).
If there are two interviewers, it's easy mode - you maintain eye contact with the one who's asking the question, while you're answering you look into their eyes for about 4sec at a time and you take ~2sec breaks by looking into the other person's eyes. Total eye contact in this scenario should be 80-90%.
