Any tips on improving my speed/stamina/finger strength?

Another thing to bear in mind is fretting in the correct position. Basically, right up against the fret wire on the body side (towards the pickups), almost touching the wire.

I wouldn’t worry about specific action measurements. What I would suggest is either getting the shop to do a setup, or if you do it yourself, try adjusting the strings until they feel good to you.

I generally lower them until they buzz and then raise them a bit until they don’t. Also you will want them a little higher if picking (but not much).

Last bit of advice, the order you do things in the setup matters. Marcelo’s video there is good.

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