you are right, the magnets in the cheap srx are smaller and weaker than in sxk version.
about getting stuck when fired: noticed that problem, tried o-rings, additional magnets.. try to unscrew the pin of the switch a bit; this fixed the problem in my mod.
i've received:
-the kato.
someone asked for magnets to upgrade the switch. it's measures should be: OD < 7.95mm, ID > 4.75. didn't find any suitable magnet

but i used a pair of o-rings, and now the throw is minimum (<1mm), and had not to sand the delrin. used a 6(OD)x1mm rubber o-ring below the head of the pin; and a 4(OD)x1mm one at the top of the pin's thread. will try a kick when the flat chi you top cap arrives here (if it ever does it, grr).
i was surprised by the weight of the mod. can't understand how it is so heavy, considering that the main body is made of aluminum. anyway, i'm loving it. =))
someone asked about voltage drop. tried with a full charged efest purple 2500mah and a kayfun with a coil of 1.2ohm. the drop was about 0.25v, which is less than i expected. it's not an stingray x, but it hits enough hard for me.
-the rose v2 (lambo). didn't try it yet (it is getting dried after a light wash, it came very clean, no oil taste) but looks like really great. the ceramic parts are not loose (which is great) but a bit tight (had to sand one of them, after breaking the other one while trying to remove it

) will report my experience.
ordered an erlkönigin in ft. got too excited when saw it. 8ml in a very comfortable (i hope) and innovator atty.