I don't own or haven't tested a CS-352 so can't help out there.
I will say that Echo has a few "home-runs" in the line-up, combined with a few very good saws, and a few "turds" as well.
My go-to saw and I keep one on my Quad and another on my side-by-side is the Echo CS-370. I own three of them, and gave one to my son-in-law recently when they purchased a new house with 7 acres of woods. They are basically pretty much identical to the CS-400 just few cubes smaller. Built like a tank and you can't wear one out no matter how hard you run it or how many hours you put on it. Is it a "screamer" in the cut, not really, but makes good power for the cc's and they are dead solid reliable. In contrast the CS-510/520 are STRONG runners, and if you compare one to a CS-490 you'll be amazed and how much more power the CS-510 has in comparison.
The CS-490 is still a very well built saw, newer design, professional features, and very popular. It's just not overly impressive for power or cutting speed. They get better if you drop back to an 18" bar, muffler mod/custom tune, but still not on par anyplace with a CS-510/520.
The CS-370/400's require a quick muffler mod, which is nothing more than removing the CAT inside the "can" of the muffler and opening up the deflector just a tad. ALL Echo saws absolutely REQUIRE removing the limiter caps before using them. I just purchased another CS-370 a few days ago and kept track of how much more fuel it needed to be happy. The "L" screw required just over 1/4 turn and the "H" screw 3/4 turns before it would start "four-stroking" nicely out of the cut and clean right up and power thru the wood when you put load back on it. As delivered it would barely stay running at idle and I had to leave the choke on for a while before it didn't stall out going to WOT. In the cut it was "weak" and stalled easily against the clutch. Anyone reading this should remember the previous statement when buying a used Echo saw. Being that lean it's likely to have some P/C damage and may be why it's looking pretty new and up on Ebay for sale....FWIW.
Anyhow, I gave the CS-370 a quick muffler mod, removed the limiter caps, and came right into it's own just like all the other Echo's that I own.
Echo seems to be going in another direction with a new line-up of saws. I've seen some new models added to the line-up recently, CS-3510, CS-4510, etc. It will be interesting to see how those pan out, especially the CS-7310P?
Anyhow, if you haven't done any custom tuning on your CS-352 remove the limiter caps and take a look at the muffler to see if it's restrictive and start there. It's still a small cc saw so it's going to be happy with a short bar. I run 14" bars on all of my smaller Echo saws with Oregon 3/8" LP chain/52dl. Makes for simplicity and it helps them more than you would think for limbing and cutting firewood (smaller logs).......Cliff