pac oem 1 or amp high level inputs?

Audio question for a pretty low-end system.

Current setup:
OEM 2011 Ford F-150 head unit
Polk audio db571 speakers in stock location
Stock wiring.
Ford sync system.

I'd like to add the following components:
Rockford Fosgate Punch PBR300X4 (very small 4-channel amp, adjustable for both high-level speaker inputs and low level inputs)
PAC Audio OEM-1 harness adapter.

My plan:
Use PAC harness so that I don't have to modify the stock audio wiring
Mount amp under the dash near the head unit
Route the head unit outputs into the amp, either through the PAC high level to low level converter, or use the speaker wires directly (This is my question!)
Route the amp outputs back up to the PAC harness, into the stock speaker wiring (to retain sync functionality and minimize additional wiring).

I can use the PAC harness with or without the line level converter. Which is likely to deliver better sound quaiity?
Using the pac converter that comes with the OEM-1?
Or wiring the speakers directly to the amp and adjusting it for the higher voltage inputs?

Before everybody chimes in, I know that there are better alternatives than either of these, like an AudioControl sound processor, higher quality amp, higher gauge speaker wires directly from amp to speakers, etc. Not what I want for this install..

Any thoughts?

In general a good external LOC is going to be higher quality than the high-level inputs on a mid-line amp like RF.

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