Fuck it, I'll put on my Patton Sperg Helmet.
If I was in command of OpFor Earl's Militia, the best plan would put out two of the best marksmen, probably on like an ATV trailer or something for just a little extra elevation a few hundred yards out and just have them pop two trannies at the same time. The trannies have no intercept or jamming equipment, so you could just have open comms to coordinate. The presence of an ATV should be pretty common in that area and shouldn't raise any alarms.
I'd put four black ford raptor trucks in two roadblocks of two trucks each, one on each side of the Tranch and one truck pointed each direction so at least one truck doesn't need to turn around if the fleeing tranchers decide to go offroad. The rest of Operation Shitlord's forces would be spread around the tranch.
Assuming they don't just straight meltdown at the first casualties, they would run to seek cover, so Earl'd just need to focus more on trying to burn down the Tranch Davidian's buildings than trying to shoot running targets. ITs dry, the buildings are all wood (or RVs) and they clearly don't have proper fire fighting equipment. No need to even waste ammo shooting into the buildings, just wait for the fire to flush them out and unload while they are blinded by smoke.
IF they go for vehicles (Pause for everyone to picture them trying to high speed manuever under fire in shitty road conditions in their leaf) the road blocks will intercept them no problem.
As you said, that place is a death trap if you do not have the superior force.
tl;dr the drills are all larping. if they cared they'd be doing MOUT style training to defend their interiors and working on replacing the wood buildings with concrete, and not trying to learn how to rush Earl's bunker complex.