Below 100% enrage kills have a VERY LOW chance at getting the main drops, which is why we've gone 82k (more now) Telo kills with only 4 weapon pieces. I don't know how much chaining increases the rate, but probably not much based on that data.
We need to do beyond 100+ and chain those I imagine for best chance at main loot.
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But don't forget that a big part of those kills are people forfeiting chaining just to climb to 100% enrage. Since people that are working on it do a low enrage kill, die, low enrage kill, die, repeat, it skews the data slightly.
With a big sample size as that anything is possible at this point.