[moo-mop]

Once when this my long-rod suddenly started obscuring the target I realised I'd got the limbs the wrong way round to normal and the tiller was way way out (sight mark down, bow kicking up, ie these limbs obviously were not that well matched in endogenous tiller). Unless tiller is your cause your only solution is heavier limbs etc - I find the longrod obscuring tends to happen at around or after the time you run out of sight mark, but I guess you are unfortunate.