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Question is , is this enough for a street motor and can I "even it up" to get more exhaust clearance by adjusting ( retarding ?) the cam timing a little.
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Those are two questions.
1) Yes, that is enough for a street motor. For what it's worth I've parked many engines @ 0.80mm, my official lowerbound. Fun fact is that your PtoV clearance is reduced slightly after TDC on the inlet because the cam is accelerating the inlet valve down faster than the piston is going down--you'll have less than 2.0mm at that point but no worries.
2) In light of point one, your urge to even it up should be gone--you're more even than you thought at 5.2mm cam timing-nice job nailing the timing.