For the Savage I am recommending changing it to have Firepower 2(6) Heavy Gunz, firepower 4(6) makes them into a reliable midrange gunship escort and that harms their theme. With Firepower 2(6) they are essentially cobras outside of 15cm.
Overall the values of the various ships should be:
Battleships/Battlekroozers: Heavy Gunz: 6(10)
Kroozers: Prow Heavy Gunz 6(10), Flank Heavy Gunz 4(6)
Lite Kroozers: Heavy Gunz 4(6)
Smashas: Heavy Gunz 2(6)
Space Hulk: Heavy Gunz 8(12)
Ork Rok: Heavy Gunz 2(6)
I really would caution retaining the free ship bonus. If i have a squadron of 6 Smasha at leadership 5/6 that means that i am getting 60 free points vs the original list (30 from the price change, 30 from the free escort.). I just played a match yesterday doing a Convoy mission with 3 escort squadrons. The match was a 400 point game for the defender and i had 3 LD 5 squadrons, so counting the free ships and the points decrease (all 3 squadrons were 5 ship squadrons) I had 160 free points! I CRUSHED my opponent as a result.
Without the points decrease I would have had 85 free points, with the decrease but without the free ships I would have 75 free points. Both effects are roughly equivalent much of the time, but put together it is simply WAY too good for a small game. Put bluntly the two effects taken together means that MOST of the time Ork escorts are effectively discounted by 10 points per model! Its just too easy to abuse that. Scaled it up to a 1000 point game and I could easily have almost 300 points of "free" stuff.