About the chunks and pooling, I dont understand the problem, what you mean?
If chain is 1023 blocks long now, then freeneters will download following files:
file with blocks 0..1000,
file with blocks 1001..1010,
file with blocks 1011..1020,
file with block 1021
file with block 1022
file with block 1023
It was described above as being in increments of 10 or 100:
{CHK key}CHK@vzy2.../btcfn-block-0.bin
{CHK key}CHK@xzw..../btcfn-block-1-10.pack.bin
{CHK key}CHK@gz3..../btcfn-block-11-20.pack.bin
{CHK key}CHK@b3y..../btcfn-block-21-30.pack.bin
{CHK key}CHK@nd3..../btcfn-block-31-40.pack.bin
{...}
{CHK key}CHK@nds..../btcfn-block-101-200.pack.bin
{CHK key}CHK@nuh..../btcfn-block-201-300.pack.bin
{...}
{CHK key}CHK@gr2..../btcfn-block-101021-101030.pack.bin
{CHK key}CHK@c2f..../btcfn-block-101031.bin
{CHK key}CHK@cd2..../btcfn-block-101032.bin