I have a Hawk, also, but, sorry, know nothing of tension repair. I hope you get some answers when you call Monday.
Mine sounds about like yours, moved twice in the 15-16 years I've owned it and it's held up well, considering I bought it as a demo model. The only thing I've replaced so far is the bellows, which someone on here kindly pointed out when I explained my problem. Hopefully, some other Hawk owners will see this soon and offer a solution. Bad timing when you have a show coming up. Best wishes for a speedy recovery.