I think you may be able to leave out the "a la boca" here.

A few examples from the more than 700,000 hits for "with excellent tension"+ wine:


"Linear and focussed, citrus fruit and green melons remain tight and poised with excellent tension and lively acidity."

http://www.crackawines.com.au/Rosemount_Estate/Rosemount_Est...


"Angular and faceted in the mouth with excellent tension."

http://www.snooth.com/articles/7-great-wines-from-la-follett...


"The wine possesses a lovely, sapid, stony line of acidity with excellent tension and a sleek shape across the palate with just a touch of baby fat. A real charmer and great value for money."

http://www.princewinestore.com.au/Product/tabid/60/82721/Dom...


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Note added at 27 mins (2012-10-28 12:24:41 GMT)
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Or perhaps "provides excellent tension," along the lines of these examples:

"Unctuous in texture, the acidity is lively and provides excellent tension and line, leading to a very long, delicately nuanced finish of honey and toast."

http://www.raymondchanwinereviews.co.nz/blog/nelsons-first-x...


“Very fine, firm and tightly bound on palate, there are very focussed and concentrated flavours of dark red berry fruit flavours supported by significant tannins, very fine-grained and forming a very long line. The acidity provides excellent tension. Still very closed, this will need time to release its full perfumes and richness.”

http://blog.finewinedelivery.co.nz/fwdc-cellar-journal-mt-di...