"Fast paced rock can make the Jolida sound a little congested with flabby bass".
A lot of things people say are a little exgagerated just to make their point and I am sure you've done the same things too every now and then. The Jolida's bass may not be the quickess of them but definitely not flabby.
You have to spend quite a bit of money more to get the Jolida analog like presentation and fast bass. Within the price range of the Jolida, sometimes you have to make a compromise. Go for the quick bass and you loose the midrange liquidity of the JD. Go for the JD and you may not get all the details you're looking for.
But be careful. There are players in this price range tend to by emphasize the treble to get quicker bass and more details but that is probably not what you want. Details, naturalness, agile bass in one package can cost quite a bit.