Handling / Frequency mods on APU modules seem to do nothing (>99%)

Tested on TL82 Holy Energy Barrel - TL82 - PSI 82 - APU 126 - FCS 75

Character has the following stats (with lvl 3 psi cbt booster from ppu)
INT=53, PSU=143
PSI=84, APU=172, PPW=60

Module 1
=======
All 99% stat module=
Damage 123 (143) = 66% (=77%x86%)
Aim = 196%
Frequency = 60/min

Module 2
=======
DAM 120% Handling 120% Frequency 99%
Damage 128 (143) = 69% (=77%x89%)
Aim = 196%
Frequency = 60/min

Module 3
=======
DAM 120% Handling 99% Frequency 120%
Damage 128 (143) = 69% (=77%x89%)
Aim = 196%
Frequency = 60/min

Dam (61%) / Aim (176%) both drop slightly when the PPU buff drops, frequency remains the same, frequency is also listed as 60/min when a different character views the module (tested on a spy and a ppu).

So my questions are these:
1. - Do Handling / Frequency mods do nothing? Or at least nothing > 99%
2. - Is the tool tip (Show info) miss reporting / not showing the affects?

If its (1) then there is no point using those mods.

- Have not checked range, ran out of modules to test it on...
- Have not checked on modules with less than 99% build quality.

regards,

Kain