It all depends how much you value your model, when I put few hundred + hours into the project I want to make sure I won't screw up on the first go.
I had a few very stressful moments in the past with no idea about the CoG, but only guessing always being so tail heavy that the only way to keep them afloat was vertical hover, bring it down as low as possible and let go! LOL.

Hovering 15.5Kwatt "Triptych at 15.5 kilo AUW, just before slamming it down with minimal damage.

Lot safer to be high.