You probably can survive heavy acceleration while breathing liquids though keeping tabs on infection and ventilator function over longer periods will be definite concerns.
The Biology SE answer indicates that it's possible for animals (very little human testing has been done) to survive for extended periods while immersed in and breathing fluorocarbons. Animal diaphragms aren't strong enough to move fluids so a ventilator must be used. Due to the dearth of research on the long-term effects of adult humans breathing fluorocarbons for weeks, months or years, everything is speculation though, given the inert nature of fluorocarbons, it would probably be okay.
Suspension in Fluorocarbons
So without a weight belt/suit, a human will tend to "float" towards the top of the tank. Under 1$g$ acceleration, a simple weight belt is sufficient to maintain buoyancy because the strain induced by differences in buoyancy between the human body and water is negligible. However, under 50 to 100$g$ the strain will be considerably more and will need to be accounted for. A full body weighted & pressure suit will be best because the less dense portions of the human body will want to float up and must be restrained.
There is also this article (paywall) about adaptation to acceleration environments.
Yes you probably could suspend a crew in a fluid for the crushing accelerations required by the OP but it doesn't take a ton of handwaving to do so. The only people you're going to really annoy are the buoyancy scientists.
From the Biology SE answer:
Kylstra, the first pioneer introducing the idea of land animals breathing liquids (Kylstra et al., 1962, found mice could withstand 4 hours of 160 atmospheres of pressure.
So how much acceleration is equivalent to 160 atmospheres?
100kpa is one atmosphere.
100kpa * 160 = 16000kpa
F=16000000 Pa (N/m^2) * 1.7 m^2
F = 27.2 MN
While 27.2 meganewtons seems like a lot, remember that this is across the entire surface of the body and from all directions so the pressures equalize. Free gases in the gut will diffuse in the surrounding tissues so decompressing/decelerating will need to be done slowly to avoid a lethal case of the bends.