I think that u can play those very maginal hands like KQ24 double-suited in limit O/8 from EP or MP. Even if this makes u "unpredictable", u still will be losing a lot of money just called with these hand PF (assuming that ur playing @ a game with decent players that can get away from hands. Even though u r doubled suited ur not drawing to the nuts, so what is the point of it being double suited? Especially in PLO8 u will lose a whole lot of money not having the nut flush when u get into big hands. From LP, opening the betting, i might raise with this hand to change things up. But playing these hands would be something i do very rarely ot make people think differently about how i play. With hands like KQ24, what type of flops are you looking for? Your looking for an Ace on the flop or you fold (unless u flop trips or nut straight). For the low ur looking for A3x, which is not going to come often. You are banking on an Ace coming on the flop with either 3 or a 2flush/straight for u, it just doesnt seem like this is +EV play (once again, if ur @ a very tight table u can play this hand from LP or even MP to take down blinds and so forth) 20% is about the right % of hands played, but u might not be playing them well Post flop or ur just not playing the right 20% (as mentioned earlier).
About the swings: The swings will be worse than u would originally think (even though its a split game) -- i think that the 2+2 split game book talks about the fact that OH8 has a very high variance and that it might not seem as much @ a B & M because so much time is being spent splitting pots and calculating everything but the swings are rather big. 6K hands is a good start, but if your really lost i suggest reading some books before you continue.
A note for the lower limit OH8:
At these low limits its usual to see 7 people in PF, so u might get the odds to call with these crappy hands (KQ24), this is why i suggest either playing higher limits of PLO b/c then u can Pot hands from LP and punish those people playing these marginal hands instead of having them call u down for 3-4BB. Also, since so many people are in these pots in the lower limits, post-flop and on you should only be drawing to (playing) the nuts, the 2nd nuts should be thrown away because there is a good chance that someone is drawing to the nuts. Also, if there are 2flushes out and u have an open-ended straight draw/wrap-around u can take 1 card off if u r going for a straight that will scoop and there are more than 4 people calling, but not more than that. A lot of ur outs are dead because of the flush draw that i can gaurantee at least 1 person is on.