Mileage Run Discussion - Need DL/NW Mileage Run for $300

Hi all,

I am basically looking to maximize my $300 NWA voucher (non-transferrable) for which travel must commence by November 5th (one week from now). It is important to note:

1) If I had to choose, for this trip RDMs would outweigh EQMs in importance.
2) I will receive 10,000 bonus RDMs for each roundtrip I take before year's end (due to the targeted promotion from earlier this year).
3) I am based out of JFK/LGA.
4) I actually prefer to travel on weekdays next week but can also travel this weekend though I'd like to be in NYC on Saturday night.
5) I can also get to other airports like DCA/BWI/PHL/BOS/HPN/EWR/BDL etc. though I prefer to start and end at JFK/LGA.

A good option I've found is JFK-LAX-SLC-SEA-SLC-LAX-JFK leaving tomorrow at 7:00 AM and returning Saturday at 7:00 AM. Total cost is $303. Total RDMs are about 35,000 (7,500ish * 2 (100% bonus based on status) + 2 * 10,000 (2 round trips)). Total rollover EQMs are about 7,500.

This could be a good option but I am also interested in an option whereby I could do 3 $100 or so short round-trips and get ~36,000 RDMs and 3,000 rollover EQMs. I can't find any good ways to depart from the eastern seaboard and do this on DL in the short timeframe I have. Any suggestions for this or more efficient ways to use the $300 than what I listed above?

Thanks for reading!

If anyone happens to have any insight about the following it's appreciated:

1) If I book a bunch of the above T fares for tomorrow, is it basically guaranteed that there will be little chance at a VDB? Or is it sometimes possible that on Fridays flights have a habit of filling up at the last minute? Unlikely, right?

2) If I take a VDB or flights get delayed, etc. and I need to rebook, can I request original credit?

3) Have any of you experienced a way to somehow extend the booking window for (or even transfer) these $300 non-transferable NWA vouchers?