I admire your attitude towards this, but objectively speaking, having to have a certain loadout to push out from your spawn area is bad design. Now couple that with an antagonist who can one-shot you like Harec. I've been on both sides of this situation, it's not a pretty sight.
I've been on both sides, and as Antagonist am absolutely relentless with shoving raiders into their spawn at that chokepoint.
As for being a Raider, the only way to really push through is to have all 4 Raiders together, pick off some enemies, and then push through at once to murder the Antagonist and just have map control again.
The problem with that is we can't communicate very well yet. Ideally we'd have voice or text-chat and be able to form a plan, but right now it's really difficult to coordinate unless all the raiders are experienced at how to push through a choke-point and know what to do.