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1985 Euro spec 190E 2.3-16

I adjusted the AF mixture too rich which caused my H5DC plugs to foul up - the car started to hesitate (its like the engine has "hiccups") at high RPM after about 2 days of using it rich. I replaced the fouled up H5DCs with H7DCs as I can no longer find H5DCs and H6DCs. At the same time, I adjusted the AF mixture to spec, now using an emission testing machine. Now, the car still intermittently hesitates at RPMs higher than 3500. Hesitation is felt more when accelerating with WOT vs. half throttle for example.

Can the H7DCs cause the hesitation?
 
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