Marquis Signature series, Artesian, Dimension one and Master has strong jets. I like the first 3 better but everybody likes something different
I would add BF, Arctic, Caldera, and a few others to the more power category. This isn't uncommon (why the wet test is important) HS has very efficient jet pumps that are industry leading in their longevity and efficiency. But I also think you give up some power to do this. They over engineer the plumbing also to help compensate for smaller more efficient jet pumps. This is OK for at least half of the purchasers in the world.......they sell a ton because they last and are energy efficient. HS makes models with more power?
Power, D1, Marquis, Sundance, MS, Calspa, Thermospa, others, you give up some energy efficiency and longevity and quiet with most of these. And most should cost a bit less.
Be careful more power can also lead to more cost to operate and more noise and itchy skin, try one out. Marquis HK jets are awesome and they put more power in, good longevity. I'm not plugging any brand. My all time favorite powerful and adjustable all the way to push you out of the seat was the D1 Nautilus. Doubt they are the same now they have moved and changed hands, try some out, make it fun take your time, get someone elses water dirty. Hell if you can find places to soak after hours your soaking. Spending more than 10 grand make them fill them up (sorry to my dealer friends)