Your answer is yes or no. Your bike is quite capable and is designed to ride wherever and tackle technical sections and technical descents. Your answer is pretty much not how the bike climbs, but how well it negotiates the terrain, especially at speed.

If you never use the dropper, or are not riding technical sections that require the setup you currently have, there are some tweaks. But if you are pushing the bike and it performs well in demanding situations then leave it as is and work on climbing technique. I only say this because most riders are less concerned with climbing and more concerned about what they are climbing for.

That said, if you are not really riding anything technical and are overbiked, which isn't a bad thing, you can go with a longer stem and move the saddle forward, and up, to get the best cockpit setup. This will move your weight forward a bit. There are give and takes and you might hate how it effects the steering. There is no way I would remove any spacers. And keep your old stem so you can put everything back the way is was.

John