I wouldn't mix and match different makes of spring. The quoted rates aren't necessarily the same as the actual rates (I have seen several sets of tests in the past that shows quite a big difference in some cases).
The HPI springs are the most popular for tarmac, but are hard to get hold of.
For the TC5 I'd run AE Blues all round; Cliff Peplow runs these and is only 2s off the lap record at Bedworth. And maybe have a pair of silvers in the box for the rear if you're short of rear traction.
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