What ohm are the pioneer speakers? The 300x2 is absolutely the most entry level of entry level amps and only performs well with 2 ohm speakers. You may want to consider the b52 as mentioned or a soundstream amp. The pioneer TS 6900 pros are an excellent entry level 6x9.
Lastly, mixing anything with boom is a crapshoot at best. I’d be pulling it all out and going with a good 4 channel amp and new front speakers.
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2018 CVO RG lava orange, 117 Stage 3, 14" F47 and a few chrome extras. Boom crap gone.
2016 RG Special Cosmic Blue, 120ST with Dragos 2:1 and TTS tuner, FBI drop seat kit and JNR air ride. Stock audio long gone.