Optimise full text query performance

There is some duplication with respect to categories in filters that produce queries with redundant clauses:

((+productCategory.category:3) +(attribute.attribute:1120^2.0 sku.attribute.attribute:1120^2.0) +(attribute.val:1120Half-Height SATA DVD-ROM^3.5 sku.attribute.val:1120Half-Height SATA DVD-ROM^3.5)) +(+productCategory.category:3)

((+(+productCategory.category:3) +(attribute.attribute:1120^2.0 sku.attribute.attribute:1120^2.0) +(attribute.val:1120Half-Height SATA DVD-ROM JackBlack^3.5 sku.attribute.val:1120Half-Height SATA DVD-ROM JackBlack^3.5)) +((+productCategory.category:3 +sku.skuPrice:[00000010_EUR_00150000 TO 00000010_EUR_00200000]))) +(+productCategory.category:3)

Need to optimise query builder interface