Try a 1/4" down or up spiral bit and bump feed up to at least 1.5. You are being toooooo cautious! With the V bit drop to 13K and again up the feed. Try not to use low end bits as this markedly affects results. you can learn about chip loads etc. by doing a search plus its built into SB3 but the easiest way is just listen to your cuts as you quickly learn just by sound. You do need more tabs though. Your router idea is sound. Amana have a magic trim bit with a 3/16" ball bearing. (Cheapest price is on Amazon) This fits easily into 1/4" slots and its very, very quick. We have a table permanently set up just for this and use the Bosch Colt for sheet work. Did you get the tool starter kit with your machine? If not order one as its great. The most common bit used for CNC has to be the humble 1/4" solid carbide spiral cutter. Its amazing what you can do with these. Top cutters equates to surperb minimum sanding finish.
Buddy BT48 with 6' power stick
2.2 HSD Spindle
Aspire 9.5
6" ShopBot Indexer