[CA] AXIOM PRO RVX

[dmb]

Hello I have a question on the new AXIOM PRO RVX, what benefit would I have if I just ran this with a 1kw B275L-HW or If I installed a CP470 and ran the same B275L-HW. Also what kind of performance can I expect on the 3d side if I ran a second transom mount transducer.
My boat is a 25 ft Hawaii fishing boat with twin sterndrive engines, I currently run another brand 50/200 1kw depth recorder with a B258 transducer mounting with a fairing block. will the B275 fit in the fairing block for the B258?
My goal is to find and track bait in the 60-120 feet, and bottom fish up to 1200 feet and also track tuna schools in deeper waters.
Thanks for any information I can get.