I’m hearing all Shimano suggestions – but from what I’ve read Deore are probably the most reliable of the Shimano brakes. Even one bike manufacturer suggests Deore over slx and XT.
Sonif you want to stick Shimano and get more power you can either put bigger rotors and upgrades pads on with your existing brakes (cheapest option) or go for say Zee to get the 4 pot calipers.
What model of Deore brakes have you got – some of the newer models have more power than he old ones – new Deore could be the answer if yours are pre m615 Deore.
Cheap and lighter but more powerful than Deore is going to be a struggle I’d think – if you lose the lighter bit you’ll have more luck.
Sram guide R could be good, as could Magura MT5 / MT trail. Hope E4 / V4 again are good brakes. Formula Cura are getting some good comments on another thread running on here this morning too.
Second hand might be your best bet – I picked up some Sram guide r’s for £80 a few months back – 6 rides in and someone had upgraded to Hope. So original pads barely worn and they even threw in the expensive Sram bleed kit. I’m using them on the Shimano rotors hat came with the Deore m535 brakes I had before the guides. Massive upgrade in power and feel for me – this is on 160mm discs with organic pads.
My bike fs bike also has the same brakes with 200/180 centreline discs on it and uberbike race matrix pads – they’re really powerful as far as I’m concerned.