Bump up #1 to 145/150, there is your slow recovery. You don't say what weight pellet you're shooting, but at 100 bar you're having to use a lot of hammer spring for little gain, I'll bet it sounds loud when it hits, bump up #2 to 120ish, you'll be cranking in your hammer spring adjuster A BUNCH but thing's settle down, I'm running a 600mm barrel. I've got 21.44mm on the over all on the HSA in my notes but I think it's wrong, I'll have to take my 600 apart and check tomorrow.
Oh crud, slugs, that is a can of worms I don't touch, way too many variables. That disclaimer stated, you need more oomph, short and fast but there is zero guarantee that it'll work. You have no guarantee that those slugs fit your barrel properly. Short term, change #1 and #2 and take your HSA out and measure it with digital calipers, hello Harbor Freight. Oh watch out for that pesky 3mm ball bearing, they try to escape, use a dab of grease in the hole to hold it in place upon reassembly.
