the main difference in the jetting is that you kind of need to pull the jet & clean it on a regular basis to make sure it doesnt' clog, that won't remove the chance that it will clog but at least it won't clog over buildup. Yes, there is a bit of tuning involved, too much water and you lose rpm, not enough water and you melt stuff.
I was hard jetted for about maybe 18 months with no ill effects at all, and the net cost was about $3
I had ECWI as well, so I just made a habit every 3 weeks or so to pull the jetted lines, poke a wire through the jet and wiggle it around there a lil' bit and stick the line back on.
I honestly can't recall the jetting size I used, its been maybe 3 years since it was first installed (a friend did it for me), 115 comes to mind but don't quote me on that, it could be way off, It was also jetted "large" for my own protection, I wasn't worried about the last 50 or so rpm's, so a bigger jet was the way to go since my mechanic buddy didn't trust that i'd check the jets often enough, and had concern's that I wouldn't notice if it was clogged in time to avoid melting stuff.
water regulators generally come pretty cheap, ranging from about $20 to $35 shipped, I know what they are "asking" for them but $20-35 is what they are selling for, and yes, its a 1 minute install. I had 3 or 4 of them laying around at one point and sold them all in the $20-25 range each.
