http://billiards.colostate.edu/threads/cue_tip.html#hardness
While your statement is technically true, I feel it is also misleading. The amount of added squirt due to a hard tip is only because of the added mass of the tip itself. Not because it's harder. The hardness actually reduces the squirt, but it is countered by the added mass of the tip being denser. So, if you had equal amounts of mass in both tips, such as a full soft tip and an worn hard tip, the hard tip would give you less squirt. The amounts of difference in squirt between the two tips are small in either case. Not enough to really be even a consideration.
To the OP, I use LePro hard tips. There are less good tips in a box these days, but the good ones are very good. And, inexpensive.