I think this is kind of a problem for the Buck coin and for the sake of the fair mining:
The difficulty should be adjusted after each block, not after each hour. Otherwise some anomalies happen. For instance: The nethash is 200 KSol, then comes the farm with 100 KSol and stays only for an hour. During this time he takes 18 out of 37 blocks. But because the block time supposed to be one in 2.5 minutes or 24 blocks/hour (not 37) then the next hour the net makes only 11 blocks (till 48 or the blocks for 2 hours) with very high difficulty level. During this time the difficulty level  adjust itself again to lower level and then the farmer comes back again for another round of easy mining. During the time he wasn’t mining Buck he mined something else. So basically he makes double the money of what he is supposed to get. So, our pool, with small miners for the next hour after the farmer’s mining we get only 2 blocks instead of 8 if our poolhash is 1/3 of the nethash.
I read that developers of Snowgem asked for help and got the algorithm for every block adjustment from some group. So if you want Buck to be competitive you have to adjust the difficulty with each block.