It's a little worse than you thought: OL picked in round 4 turn into consistent starters 29% of the time, in round 6 it drops to 16%. The following chart covers 2005 thru 2014)
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Historic Success Chart
"What the stats tell us about drafting positions by round" [www.arrowheadpride.com] This <article> has a simple criteria: How many players were drafted by position and round over the last decade and how many went on to become a starter.
The numbers show us the following outline for finding consistent starters:
1st Round - OL (83%) LB (70%) TE (67%) DB (64%) QB (63%) WR (58%) RB (58%) DL (58%)
2nd Round - OL (70%) LB (55%) TE (50%) WR (49%) DB (46%) QB (27%) DL (26%) RB (25%)
3rd Round - OL (40%) TE (39%) LB (34%) DL (27%) WR (25%) DB (24%) QB (17%) RB (16%)
4th Round - DL (37%) TE (33%) OL (29%) LB (16%) WR(12%) DB (11%) RB (11%) QB (8%)
5th Round - TE (32%) DB (17%) WR (16%) OL (16%) DL (13%) RB (9%) LB (4%) QB (0%)
6th Round - TE (26%) OL (16%) DL (13%) WR (9%) DB (8%) RB (6%) LB (5%) QB (0%)
7th Round - DB (11%) OL (9%) QB (6%) WR (5%) DL (3%) LB (2%) RB (0%) TE (0%)
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