First some background;
This may be stating the obvious, but you need to address the root cause of running up such substantial debts by reducing your outgoings and/or increasing your incomings.
Also, note that historically, your decision to fund your SSIA while carrying debt like this has cost you money, as you've been paying more interest on your debts that you've been earning on your SSIA. Ironically, as you come towards the end of your SSIA, this situation reverses, and you are probably right to continue to fund the SSIA now (depending on when it matures and what interest you're earning on it). So your approach of waiting for it to mature and clearing half your outstanding loan probably makes sense.
In general, I wouldn't get hung up on the different APR's on your loan - 8.2% to 8.5% to 7.9% won't make a substantial difference to you. I'd recomment that you concentrate on getting the credit card debt cleared asap, and ensure that it doesn't climb back up. Clear your bill in full each month.
I'm assuming you don't have a property/mortgage which would allow you to borrow at much lower mortgage rates? If this is the case, I don't see that loan consolidation is going to do much for you. Concentrate on reducing the overall level of debt. If you do consolidate, make sure you take out a flexible loan with no penalties for early repayment.