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Removing the reflectors may help me pick up 33 or 16 NBC and keep channel 6 without having to invest in a VHF antenna.
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I think you should try it to satisfy your own curiosity; you will not be happy until you do.
Keep in mind that when you remove the reflector and make the antenna bidirectional you will lose about 3 dB of gain; there is no free lunch.
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If I am pointing towards the South at 181 degrees only (with both UHF and VHF antennas), what type of preamp would be suitable?
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A Channel Master 7778 or an RCA TVPRAMP1R.
The 7778 would require a UVSJ to combine the UHF and VHF antennas before the preamp.
The RCA is less expensive and has separate inputs for UHF and VHF antennas. But, it has some quality control problems including a history of problems with the separate/combined antenna switch. Sometimes the switch doesn't make good contact with the VHF antenna in the separate position. The fix is to combine the antennas with a UVSJ and connect to the combined input of the preamp.