If I'm a climber, worried about carpal tunnel, tendonitis, etc, I'm not raking. Pay me to get 'it' done, and use my other skills to your advantage.
Consider if another groundie would actually speed stuff up, and if a competent climber is a competent client-interface person, they can be pre-viewing work to be bid by the salesperson (you?? or them or dedicated salesperson), adding work to the jobs from neighbors, while a groundie works within their pay-grade. Even just an afternoon part-timer who comes in for half a day or more.
Personally, I often need extra help at the latter part of the day. Having someone fresh show up after lunch can be a winner, and avoid 12 hour days that sap the next day's progress.
I, personally, don't usually have time to jump in on a small job for a neighbor when I am not planning for it. When I have the time to add-on for the customer or neighbor, I'm making extra money without mobilization expenses. Just did an easy $600 job for the neighbors, without moving anything. Oh, and they have a monsterous maple that was topped and is about 100' tall and 4'-5' through. Getting the $600 job opens up work at the neighbor's house until I retire.
When you're drowning in work, you're losing opportunities, IF you can find the right person.
At a bid, I spend a lot of time pinning the customer down on the scope of work/ septic location/ goals and objectives, that could be pre-scoped by the climber who is now done climbing, ready for the salesperson to bid quicker. IF this is you, you need to save as much time as possible. A bid-info sheet helped me when I was having someone bid work in my absence (specs on deadwood size, equipment needed, utility locations, material processing needed, etc).
I don't get how people bid work for others to do, without lots of problems, when it's something beyond removal, grinding, basic tree care.
If I bid a job I'm going to handle later, I have time to tumble the plan around, not showing up to work immediately after getting out of the truck. The climber can work more efficiently with a preview, making less work, same money, IMO.
$0.02
Are you only contracting subs, not hiring employees?