Welcome aboard scyharris :!: :!: Our 170 family just keeps growing and growing. 8)
I bought a Bob's plate and found that I lost 2 mph with it and I didn't gain anything noticible in control or planing - so I took it off.
I've never had a problem with boat angle at any speed and I have a 115, 2 batteries, powerpole and it's pump, and a trolling motor on the back. My fuel tank is under the console. If I had the option I would move everything possible under the console.
A lot of 170 owners swear by tabs in this family, I myself have never seen a need.
You should be fine. My $.02