FT-Weapons help

A quick question to people out there, do you consider the following weapons
balanced or not?

Weapon	   Arcs      Mass     Cost
Pulser (c) 1 2 x5 " " 2 3 x5 Light " " 1 1 x3? " " " 2 2 x3? " " " 6 3 x3?

The light pulser is a weapon with the same range as a normal pulser (in this
case, 12 mu), but only half the dammage (3D6 beam die). Cost is a lot cheaper,
but still rolls PDS same as a pulser. the 2 arcs above can be taken as 3 arcs,
I just used 2 arcs due to the notes being from trying to design a HH style
ship with broadsides. In the same vein, what does anybody think about these MT
missile launchers (internal launchers with ammo, a la
SML`s)?

                                                                  Per
missile
Size	   Arcs       Mass	Cost	  Dammage   Ammo mass
Lt 1 1 x3 or x4? 2D6 1 " 2 2 " "
"
Mdm 1 1 x4 3D6 2 " 2 2 " "
"
Hvy 1 2 " 4D6 3 " 2 3 " "
"

I was thinking of allowing the Hvy MT missiles a -1 Vs PDS (intercepts
on a roll of 5 or 6) to make up for the heavier launchers and ammo
requirements. The reason there is light, medium and heavy missiles and
launchers is that to fit a decent ammo into light ships (DD`s & CL`s) is more
difficult than a SD, and the missiles in HH were different sizes for the
different classes of ships. I kmow this may be off topic, but I was after
peoples opinion if these weapons were too unbalanced Vs normal FT weapons,
especially as the MT missiles and launchers were developed from the launcher
given in the WDA.

Awating any comments/feedback (please).