First of all, it you have $300K in a retirement account and have an 85K per year job, you are a lot better off than many in America. So congratulate yourself a little for not being in the hole as so many are, even at 46. Then get to work on a plan to fix your current problem.
PSI Signore gave you some sound advice immediately above.
I did not post in the first thread, but just read through the many snippets of advice.
The real issue here is your ability to discipline yourself and to have a budget and understand money flows. If you can;t do that, none of this advice will help you much.
In a perfect world, you can take the $85,000 annual pay and break it down to a monthly pay and then figure out your disposable budget by subtracting mandatory expenses such as taxes, insurance, rent, auto costs, repairs, utilities, food, etc.
Look at what is left. What would be perfect is that there is enough left each month to pay the the maximum 10% contribution, and the $216 loan payment and $1,000 to pay off the $12,000 you put on the credit card before it begins to accrue interest. One year may seem like a long time, but it will be here pretty quick and if that $12,000 debt is still all there, who knows what the interest rate will be. I would bet from 12% to 18%.
I imagine you could do it, but the budget would allow no perks (or a substantial reduction of the perks) that you probably are used to. Minimal dining out, no entertainment expense, no PSU football games, no fine wines, no gifts for GFs, no 4$ Starbucks on the way to work. etc. Only you know if you can discipline yourself for a year to find all those little pockets where we all spend money on things which are not absolutely essential and redirect that money like a zealot to paying off the credit card before the interest begins.
If you pay religiously on the loan and whack the credit card debt down to say $5,000, you might be able to talk the lender who gave you the loan to increase it by 5K as the original $8,200 would be paid down some. Might work, might not, that's why it is important to get rid of as much of the credit card debt as fast as you can as your budget allows.
Good luck.