I not either of those races / profession's either but
i had this discussion with lone.lycan before they left the forum

anyrate, as anarelen fixer you get +30% defense and +30% hull --> ~ +47% defense with Velox / ~ +66%defense when attacked if you have trinity , and ~ +41% hull with kalviums. upside you get a good hull boost and your defense gets pretty nice as well, downside is, as stated people / NPC's can debuff you.
Flipside, as a Lazuli fixer you get +50% from race and +30% from fixer + another 10% with kalviums, and since the math is cumulative, and not linear you end up with something larger than you think:
1 + 50% = 1.5 --> Lazuli
1.5 + 30% [ 1.5 * .3 + 1.5 ] = 1.95 --> fixer
1.95 + 5% [ 1.95 * .05 + 1.95 ] = 2.0475 --> Kalvium 1
2.0475 + 5% = 2.149875 --> Kalvium 2
2.15 - 1 (initial 100% hull) = ~ 1.15 or 115%
it equates into how much of an energy sink you want to be and how big your crew is really.