IMO, considering you have Attack Pattern Delta Prime and presumably want to keep using APD, I would make the ensign universal a TAC and drop OSS2 to OSS1 and get an APB in the LT tac seat. A single APD copy, even brought down to global, does not sync with a FAW cycle. However, an APD/APB (or APD/APO) rotation does. APB is the only attack pattern you can use with a single copy (assuming the proper cooldown management) and sync with a FAW cycle.
In other words, with an APD/APB rotation, you would be to sync an attack pattern with every FAW cycle. This is very desirable.
For your engi universal, I would run Eng Team, RSP (with a Fabrication Engineer doff for 16 secs of RSP), EPTW3 and A2Sif. I would use A2Sif at the end of your main offensive cycle to proc Attrition Warfare. Attrition warfare is a 30% cooldown reduction on ALL boff abilities that can be procced once every 20S via the activation of a hull heal, which in practice is all you need to keep at TT/KLW/APx/FAW roation going. Be sure to place your EPTW within your offensive rotation since Attrition Warfare will keep it on global (or an EPTW/EPTS rotation if you desire to keep EPTS). I shared some thoughts on this subject over on reddit
here. My opinions have not changed since then. On a side note, you will find that keeping an A2Sif rotation going will give you a VERY noticeable survivability buff. Just remember to always keep threatening stance "on" like any good tank should
However, at first, you may certainly keep reciprocity in the interim to see how comfortable you are managing your cooldowns via atttrition warfare.
On a side note, most high-end Tarantula pilots I know use the Web Cannon console. Not owning the Tarantula, I have no personal experience on the subject...but I know that upwards of 10K from the web cannon alone is not uncommon.
For reference,
here's a nice video of a 150K Tarantula piloted by an engie like yourself. At the end of the video he showcases his build...just for reference should you need any further inspiration.
As a final note, considering you are an engineer that does not need to reach very low hull for good GDF's like us Tacs do, I would not bother with Invincible.
In any case, 100K is a great achievement...well done