New brake pads required - cartridges?

I've got a set of Shimano BR-R451 deep drop callipers on my winter bike, and after 800 miles and a fair old amount of steep descents, i've worn the original brake blocks out on them. I need to get some replacements.
The originals to be honest, havent been great as i've struggled to keep the speed scrubbed on some of the steepest downhills (Yorkshire Dales). I'd like to upgrade to cartridge pads. Can I use these with my callipers? Which are recommended for best stopping power?
Theyre linked up with Tiagra levers so whilst not being the best bits of kit, I'm looking for the best value vs effectiveness if possible.
The originals to be honest, havent been great as i've struggled to keep the speed scrubbed on some of the steepest downhills (Yorkshire Dales). I'd like to upgrade to cartridge pads. Can I use these with my callipers? Which are recommended for best stopping power?
Theyre linked up with Tiagra levers so whilst not being the best bits of kit, I'm looking for the best value vs effectiveness if possible.
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As long as you make sure you get Shimano compatible pads and cartridges (the latter with the little screws to retain the pad) it shouldn't actually matter functionally what you get. But I seem to recall that people say that the Shimano pads are overpriced for what they are (might be wrong though). Really it's down to how much the cartridge costs and the relative lack of importance of the rear brake - hence why the Barradines work as a solution. The 105 cartridges will work fine with whatever but just might cost more.
I would remove the little screws before fitting. They can seize in, and the little allen key fitting doesnt give enough purchase to get em out. The pads are naturally shoved into the cartridge by braking anyway.