Hi-
When you say you’re doing the incline 2x a week- as in one lap on two different days?
With Sam I was doing 3x in a row – 1st with heavy pack slow 2nd lap about half as much weight 3lap no weight ( water/jacket/pack) pushing hard… first (2) laps I went down incline 3rd lap I walked down trail….
Obviously pack weight is relative to other uphill work w/ pack… I also did 1-2 laps heavy pack using water I dumped at top. For those I carried ~30lbs, without going and looking I think the (3) laps was mid 20lbs first lap etc.
Also did one heavy lap on incline, down and reload water at truck and went to Barr camp via trail…. sometimes I’d drive to crags trail, hike to top…
Any of those or similar would give you lots of elevation maybe try something like that?