really fast miner (280 Mh/s) generates low difficulty share errors

[jjj092353]

I'm testing a really fast machine (280 Mh/s) with hobonickels and get these errors repeatedly

2014-10-27 23:04:00 [Pool] [hobonickels](Thread 1) Share rejected: {"job":"20","ip":"nn.114.187.5","worker":"xxx.mat","difficulty":31200,"error":"low difficulty share of 0.00010443938208130006"} 2014-10-27 23:04:03 [Pool] [hobonickels](Thread 1) Authorized xxx.mat:123 [nn.114.187.5]

I've played around with all kinds of combinations but have settled on this for the time being - since it results in the least number of errors

    "8334": {
        "diff": 42500,
        "varDiff": {
            "minDiff": 53000,
            "maxDiff": 124800,
            "targetTime": 15,
            "retargetTime": 60,
            "variancePercent": 30
        }

any ideas on how to get rid of these errors?

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