[Maz]

Some general suggestions and comments:

Its not that difficult to dodge guns (in GURPS). Allow Extra Effort in combat to allow your PCs to spend FP to boost dodge. Also remember acrobatic dodge.

Do not give your mooks high gun skill and be strict about penalties such as speed/range and darkness.

Do not let mooks take the Aim manoeuvre.

Let mooks with high RoF guns take Suppressive Fire action instead of normal - targeted - attacks.

Ultra tech has pretty cheap and effective armoured clothing, which has high DR vs guns but low vs impaling and are flexible so you can still hit them. Maybe combine with generous Armour Divisors for melee weapons.