Hello, Mofi, I think the original poster is referring to the scrubbing brush not covering the entire surface of the LP when placed upon the record to auto-scrub, and not the vacuum wand, or to do with fluid removal with vacuum wand.
I'm not that familar with VPI 17, or typhoon, which have auto fluid dispensing, and auto scrub feature, but others here might be able to steer you towards another, 3rd party brush which works better than the VPI, and that will mount to the holder assembly?
I know this defeats the purpose, and the additional cost spent for the model 17, but many forego using these brushes, for other types. These other types would of course have to be hand held, but do have the advantage of cleaning every last area of a record, and do it in a better way, without risk of vinyl damage.
The consensus of the VPI Brush, is usually 70% of users don't like it. It is not that effective, and some have noted scratching. Many particular vinylphiles, who use an RCM of some sort, and have run the gauntlet, usually switch to multiple step cleaners, such as AIVS, or Walker Prelude. This means they typically use a dedicated brush, or pad for each cleaning step, as well as for a final pure water rinse.
IMO, these methods produce the finest results, and the two cleaners I mention above are generally believed to have no peer.
I use Mobile Fidelity, or Disc Doctor Brush Pads for my cleaning-rinsing steps, they work great. All are labeled, so there's no chance to mix them up. Mark