compression and fuel delivery are not really related at such low levels. I think you are confusing fuel psi with compression and boost psi. you will be more than fine with the motor running at 9.2:1. mot people run mid 9's:1 on their hondas.
an fmu works like this:
your base fuel system runs roughly 38-42 psi at the fuel rail.
as the fmu sees boost (instead of vacuum) it rasises said ail pressure at a rate of (8/10/12):1, or say 12 more psi of rail pressure for every psi of boost it sees.
at 5 psi on a 12:1 fmu, you have added 60 psi of rail pressure to your 40-ish base, for an end result of abotu 100 psi of rail pressure.
While great in design and perfect for low-power, low-boost, small-turbo applications, the FMU is VERY limited.
A key thing to rememebr is that PRESSURE is NOT VOLUME. at some point, regardless of the pressure in the rail, the stock injector simply can't handel the volume of flow that is needed for the combustion process.
Along the same lines, you have to be able to supply the rail with that much pressure in the first place. Thus, an inline fuel pump booster is required, and an in-tank 255lph (litres per hour) hp (high hpressure) is recommended.
fmu size depends on your turbo size more than anything.
a dinky t25 will be fine on a 10:1 fmu at any psi
a t3/t4, will not.
Vortech makes a good 12:1 FMU
http://www.optauto.com/webstore/product_in...item=8&back=yes