Trying to hide from the Reapers is pointless, they'll just destroy all fuel depots and camp the relays, then just wait for the Quarians to run out of supplies. Some Quarian Captain is eventually going to get desperate and is going to end up doing something stupid in order to save his crew from a slow and painful death, and he'll end up giving away the rest of the fleet's location in the process.
The Reapers have time on their side, it's an inevitable win for them.
The other problem is that as the creators of the network, the Reapers know the location of ALL the Relays and where they lead to, whereas the Council's fear of opening unknown relays and causing another Rachni War means they've only explored a small amount of the network.
It makes me suspect that was probably the reason the Reapers manipulated the Rachni to go to war in the first place and that they use this kind of tactic each Cycle to instill the fear that "Here Be Dragons" is what potentially lies beyond any unknown relay? It would be an effective way of limiting expansion, so the races have less foxholes to hide in when time comes for the Harvest?
And it was probably worse for the previous Cycles, since Vigil implied in ME1 that before the Prothean's sabotaged the Citadel, the Reapers were able to lock down the Relays so only they were able to use them, forcing the Protheans to rely on conventional "slow" FTL to fight them?
That might also explain why the Charon Relay was encased in ice in so short a period of time? Perhaps the Prothean researchers on Mars, stranded within in the Solar Sytem, took advantage of the Relay being inactive to deactivate it's self-cleaning function and purposefully seal it in ice in the hopes that the Reapers might pass them by?