Hi Ravi,
We did two actions to avoid the overflow problem:
1.- Ask our banks to debit all transfers one by one (except the payroll), then our F110 process is also individually posting in the bank account, and finally the statement upload process is automatically clearing the transfers one by one. This is the way we can avoid massive clearing documents that produce later problems in FLQ process.
2.- Where it's not possible to avoid massive clearing documents, because users need to clear hundreds of positions in the same document, we are using the FLQINFACC customizing, it's not the preferred solution but sometimes you have to sacrifice accuracy for speed.
I've never used RFLQ_OVERFLOW_FI, but after having a quick look sounds like it will consume some development time because of the exits you will have to use in FLQC13, it's an interesting option though, hope you can find the solution through it.
Cheers.