Metal Slug Attack Reloaded: World 6 (Minimum Grinding)

I'm doing a playthrough to try see how far I can get with as little grinding as possible... (No replaying stages to farm unless absolute certain can't beat the stage) and no diamond bordering (or abusing the number of medals for summons to get units evolution up) units immediately.

World 6 has only 1 really tough stage imo, which is stage 3 as it has the most shielded soldiers that appear in the stage. Stage 4 was also quite interesting with the Heli rocket spam. Although they aren't permanent so Heli rocket spam doesn't stack too much to exponentially kill base faster, so tanking with base is a viable strategy.

Timestamps:
00:00 Stage 6 - 1
01:30 Stage 6 - 2
04:12 Stage 6 - 3
07:32 Stage 6 - 4
09:38 Thank you for Watching