MT Heavy Missiles and Ship Defenses

I was re-reading the More Thrust book and I came up
with a few questions about MT heavy missiles.

When I was looking at the prices, my initial reaction
was that MT heavy missiles are too costly.  2 mass, 6
points for a one shot weapon that can be shot down
seemed a bit pricy. I started doing some comparisons,
and they're not too bad.  Figure that 3 MT heavy
missiles have a mass and cost the same as a fighter
group.	The fighters have more flexibility as far as
movement, and a bit more combat duration, but the MT
heavy missiles are harder to shoot down and do a lot
of damage.  

Here's my question....

A fighter group is hit on a 4,5,6 with PDS, and a 5,6
with Class-1 beams.

A heavy missile is hit on a 6 with PDS, but there is
no note in FB1 as to how Class-1 beams would fair
against MT heavy misses.

I was thinking that if you follow the trend of PDS and
Class-1 beams against fighters, Class-1 beams are less
effective by 1.  So, my conclusion is that the Class-1
effectiveness against heavy missiles would also be
reduced by 1, which would mean that Class-1 beams
cannot fire on MT heavy missiles in a defensive mode
(no way to roll a 7 on a six sided dice.....at least
not any of MY six sided dice).

Can anyone tell me if this is a correct extrapolation?

BTW, I have realized that this is my next tactic
against the giant customized Sa'Vasku monolith ships. 

3 MT heavy missiles are the same cost and mass as a
fighter group, but it would need three times the PDS
to target all three MT heavy missiles.

I am thinking of converting my carriers (4 fighter
groups each) into MT heavy missile platforms (12 MT
heavy missiles for same cost and mass as the 4 fighter
groups).  The enemy ship would need 12 PDS instead of
4 to target all the MT heavy missiles.	Plus the MT
heavy missiles are less likely to be hit (although the
ones that are hit are TOTALLY destroyed, vs fighters
which lose a bit of combat effectiveness, but usually
have a few fighters remaining to press on the attack.)

If my conjecture above about Class-1 beams not able to
be used against MT heavy missiles, then they are a
great concept for swarming the Sa'Vasku mother ships. 

A combination of normal MT heavy missiles (2d6 damage)
and EMP MT heavy missiles (threshold rolls against all
systems) could potentially ruin someone's day!!

Can someone let me know if my assumptions about
Class-1 beams vs. MT heavy missiles are correct, and
if so, has anyone tried this tactic?

=====
Thank You,

Shawn M Mininger

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