There's not going to be one right answer to this question. Firstly, deflection is influenced by many variables, and it is not accurate to say overall that a custom maker's standard shafts are high or standard deflection. That is going to vary, and besides there isn't a standard to judge what grades out as high vs standard vs low deflection. Maple isn't inherently high deflection. Several shaft makers these days are using carbon fiber because it is lower density and the most important characteristic in deflection is mass near the tip, but although that means the lowest deflection shaft will be carbon fiber, it doesn't mean that all carbon fiber shafts are lower deflection than all maple shafts or that maple shafts can't be low deflection. Indeed, although the Revo is provably lower deflection than its predecessors, the pioneer low deflection shafts are maple.
What would I do? I'd definitely get at least one shaft from the custom maker. Ideally, you'd also be able to test a LD shaft with the same cue to compare before sinking the $ on it and then ask the maker to put on a collar with matching ring work if you like it. Otherwise, if you're just a casual player and you enjoy what you get, stick with it. I'd also be aware that there may be big differences to you just in the tip that is installed, so it's often really hard to tell what you like best unless you get to try a whole bunch of cues/shafts/tips over time.