The original Opto Sparks came out very overstable as you know. Mine were flying pretty much just like a XXX. Try one of those.
Xxx are also pretty variable in flight pattern. I have had couple of those and they were more understable then what i am looking for. Or they just had more glide making them fly straight longer.
Felons are familiar also. Lucid ones were good at first but weared quite fast.
The best thing in old spark is that it is so durable. It flies the same after couple years of beating.
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