That’s what Quasars are for SS works best after Dukino’s Mum on the Peak, but you’ll be kicking yourself when you don’t have it! Chasing Surveyors is the biggest drawback.
I second and third and fourth the SS/Binder suggestions, with 10 points in Reaper you can OHKO most small enemies and with 10 in Wreck you can burst badasses and mini-bosses. 10 in Suspension also makes SS virtually mandatory with a Binder, and if you put one point in Sweet Release you’ll be getting 3-4 procs of it per PL which will render all other healing skills obsolete, bar Life Tap, but with a Binder you always want to be running SS so LT misses out, though you’ve got SR to make up for that.
As for your weapons, I’d go for something with high base damage like a Snider/Pimpernel or a high powered shotgun to really benefit from Reaper. The Bitch is great for Wreck abuse, especially against Constructors, but on the Peak you may want a Sandhawk for bosses and in particular Dukino’s Mum. For general mobbing I’d suggest a Blockade, but the Peak has plenty of cover to utilise The Bee, just make sure you max out Ward.
This is the build I’ve been running for about two years now, with a Legendary Binder, it’s great for general mobbing, DigiPeak, and raiding, with a few gear changes depending on the area/scenario - http://bl2skills.com/siren.html#555001545041050100000554510501