I have a Zenith upgrade. I don't even use it anymore. The ONLY time I found it useful was for fletching X10's and ProTours. Anything 4mm or bigger I never saw a benefit at all.
Since you have the deck up you may want to consider checking out how saturated the floatation foam is. My 2000 Sylvan was saturated...the foam weighed many hundreds of pounds. Had to cut it all out and pour new.
The best I can offer is that a local grocery store chain usually runs a Black Friday sale where all gift cards in the big rack of gift cards is 50% off up to $200. I may have picked up 6 $200 Cabelas gift cards for $600 total to put towards my Swaro SLCs a few years back
Mt TC Omega was a PITA to load. I used to put a thin coat of bore butter on the sabot before loading it. THis helped some, but the 2nd shot would barely load and the 3rd shot was damn near impossible without a tree nearby to smash the ramrod off of. I have heard the Harvester Crush Rib Sabots...
No strength lifting your arm straight ahead or off to side, Shooting pain trying to get your hand behind your back, dull achy pain all the time, shooting pain trying to raise arms from side, drop you to your knees/see stars pain if you have a jolting movement etc