General Maintenance & Repairs - Rear main still leaking

This past week me and a buddy pulled an all nighter and installed my tick rebuilt trans and monster level 2 clutch kit. Well long story short the rear main seal was leaking so I changed it and to my surprise I look under the car and it's still leaking. Is there any additive that works to help I don't wanna remove the trans again

Additive to what......the oil....?????

NEVER EVER ADD ANYTHING TO YOUR OIL......

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Probably not the rear main.

Either

The bolts to the rear cover are leaking

OR

The cam sensor is leaking into the bell housing.

Make sure your PCV is working properly.

Okay I won't add anything. And I torqued all the bolts to spec so idk and the PCV system has been changed to a ls6 valley cover with a hose from the engine valley cover to the intake manifold. And the port on the rear of the driver side valve cover is plugged. Is that correct?

I followed the how to guide on ls1howto

LS6 valley covers are terrible.......in that they allow WAY too much oil mist to get sucked in to the intake. Don't hook the line going from the valley cover port to the intake. Cap off the valley cover port and hook the line going from the passengers side valve cover to the intake port.

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What about the line that goes from the pass side valve cover to the TB because it's connected

my money is on the rear cover gasket being the source of your leak. i know you dont wanna drop the tranny again but its gonna leak till you do