I have concerns about your tensioner re-installation technique. It should not be hard to screw into place. It should be disassembled and the main body installed first, which is easy. Then the plunger and spring followed by the cap. Screwing in a whole tensioner at once is a recipie for disaster.
That said, it sounds too frequent to me for it to be valvetrain related. I'd be suspicious of the bottom end, possibly a broken piston skirt allowing too much piston rocking.
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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start
90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff
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